temporary dns error inet_e_resource_not_found - wordpress

I wondered if I can pick your brains with a project we have and see if you have maybe experienced this issue?
Basically we have a new site which is on...
https://securetronics.co.uk
temporary dns error inet_e_resource_not_found
http://prntscr.com/kjss65
But for some reason sometimes on chrome and edge it comes up with this error and I have no clue as to what is happening! It is a new one for me and can’t fathom out what could be the cause! I don’t think it is the website and everything I Google is coming up with it saying it’s a browser issue.
It comes on but then vanishes if refreshed and won’t appear for ages, but say like day after etc it comes back?
The problem is that my clients site is an eCommerce site so if any of his potential customers go to the site from the browser and it comes up with that error they are going to be put off instantly!
Any help would be appreciated as I am at a loss here!
Thank you
Chris

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My website is showing an error related to googlecm.hit.gemius.pl in console

I have a WordPress website, and I use Adsense. However, for a couple of days, I have noticed these errors in the console, and I don't know what they mean.
All of them are related to this URL: https://googlecm.hit.gemius.pl
The errors are saying:
Failed to load resource: net::ERR_ADDRESS_INVALID
GET googlecm.hit.gemius.pl/googleredir?rid=... net::ERR_ADDRESS_INVALID
I don't know what it is, please clarify this to me.
I was able to figure this out. It was not the plugin, but rather an Ad Network on Google Adsense. All I had to do was go into the Google Adsense >> Blocking Controls >> Content >> Ad Networks. Then type in Gemius and disable all ads from their network. The problem goes away and you get to work with Adsense again.
I don't have the best answer, but ... I noticed my site is doing this too. It's a pretty simple site, with just a few tools some people use. If I disable Google's ads, the error goes away. If I re-enable them, they come back. I double checked ad content, and they're all legitimate.
The requests aren't being generated by my pages. They are only generated by Google's ads.
My site is hand coded, not WP or another CMS, so it can't be a hack or anything. I literally read every line of code related to that page while trying to diagnose it. It wasn't hard, because there aren't many lines of code. :)
So, to make the error go away, you'll need to turn off Google's ads for a while. It really isn't necessary though.
The good news is, that error means nothing was sent to the gemius page. It is simply unreachable right now, for whatever reason. I guess Google will fix it eventually. I don't care enough to open a trouble ticket with them. I'm just considering it a curiosity and annoyance on my otherwise error free pages.
screenshot with googlecm.hit.gemius errors
I believe this is related to the plugin Google Ad Inserter. Took me a while to figure out and I'm still trying to clean it up. After removing the plugin a lot of the redirect errors went away and Google was able to index my URL. After going into Chrome developer though I noticed that there was still some redirect errors happening on some resources left behind by Ad Inserter. Once I figure out how to get rid of them I'll post an update. Had a huge impact on my blog though. Almost lost 30% of my page views for the past couple days...

How do I fix: Lighthouse returned error: FAILED_DOCUMENT_REQUEST

I have been actively trying to redesign, increase page speeds and other things for my workplaces website. (Built by a previous employee using a custom Wordpress theme) I had been notified that this error has been starting to come up when testing our page speeds now. The scores we had been getting originally were appalling anyway so it's not really much of a surprise to me to be seeing errors haha.
Could this be because of broken links to google analytics? Or that The webpage is just so slow it wont test it?
Any information on this issue would be really helpful.
while I was testing my site where I used self-signed SSL certificate, I got the error. I switched the site to http instead of https, then I got Lighthouse loading the page and showing score. Hope this helps someone.

Google PageSpeed Insights Error on everything

When I test our site with PageSpeed insights v5 i get Error! for all lab data and opportunities.
It also is telling me I have way more assets than there really is.
It is basically multiplying how many assets are really there by the number of products shown on the page.
We have an ecommerce website.
Any help or insight would be great.
Thanks
The new PSI is a little buggy and overloaded since it came out, everyone is trying to jump in.
I suppose therefore you tested it on a website, try running it on a chrome lighthouse.
Also if you are using any caches, try to delete those in case those resources are left behind in the cache.
Cheers

Wordpress not reflecting phpMyAdmin database changes unless I log in

this is I think a really unusual case. A little backstory, I outsourced a PSD to WP project a few months ago, but not currently working with the developer anymore as he stopped replying to my support questions. I'm trying to solve this on my own before I give this to the client, as I have no more budget to hire another developer.
I have two problems, first is I couldn't access the WP dashboard even though my login is an admin account. Been trying to solve this through numerous google searches and blog posts but to no avail, I couldn't fix it.
Here goes my main problem: So I finally found a way how to update the content on the site using the phpMyAdmin backend database. (good thing I know HTML CSS)
I managed to update the content, but when I tested the site using incognito window and other profiles / browsers, the changes from phpMyAdmin does not reflect on the site. I tried logging in, and weirdly, the changes are there. I log out, changes are there.
I just find it really weird and a hassle that I have to log in to see those changes. It's a client facing site, and the changes are really important so I hope someone has experienced this before and can help me out. Thanks in advance.

occasional client error fullcalendar.js

I am trying to help sort a friend's issue with their fullcalendar.js implementation.
The problem thus far is the events not loading consistently. Before uploading it to the Godaddy domain it worked every time but is spotty at best now. I looked at the Google developers tools and the credentials are all squared but saw that there is a client error happening however, I'm not sure where to look to fix an occasional problem? I am led to believe it is some sort of server issue but don't know where to start looking.
I don't have any rep so no pics, here is a link to the dashboard.
https://www.dropbox.com/s/x1xfuyonavxz3vi/Screen%20Shot%202015-01-07%20at%2010.42.53%20PM.png?dl=0
Any help would be amazing, thanks!
Edit:
I contacted Godaddy to no avail, they said it was Google's issue and I should contact them.. which isn't possible without paying for it.. Also, I found a work around: if I refresh the page navigate away and return it loads correctly.. any ideas on how to code it so if it fails to load I can get the same process?
Hopefully this will help someone else, but...
I fixed my problem by changing the hierarchy of my files. I moved the calendar to the public html folder instead of the nested html folder. It seems as if the Jquery request to Google was getting interrupted or bogged down somehow, but, thus far I'm digging the 100% success rate. If anyone cares to weigh-in further, I'm happy to hear other suggestions.

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