Page limit using rvest - r

Question

I'm having an issue when using rvest to scrape 466 pages from a wiki. Each page represents a metric that I need further information about. I have the following code which loops through each link (loaded from a csv file) and extracts the information I need from a html table on each page.
Metrics <- read.csv("C:\\Users\\me\\Documents\\WebScraping\\LONMetrics.csv")
Metrics$Theme <- as.character(paste0(Metrics$Theme))
Metrics$Metric <- as.character(paste0(Metrics$Metric))
Metrics$URL <- as.character(paste0(Metrics$URL))
n = nrow(Metrics)
i = 1
while (i <= n) {
webPage <- read_html(Metrics$URL[i])
pageTable <- html_table(webpage)
Metrics$Definition[i] <- pageTable[[1]]$X2[1]
Metrics$Category[i] <- pageTable[[1]]$X2[2]
Metrics$Calculation[i] <- pageTable[[1]]$X2[3]
Metrics$UOM[i] <- pageTable[[1]]$X2[4]
Metrics$ExpectedTrend[i] <- pageTable[[1]]$X2[6]
Metrics$MinTech[i] <- pageTable[[1]]$X2[7]
i = i+1
}
The problem I'm having is that it stops returning data after 32 pages giving an error as:
Error in read_connection_(x, n) :
Evaluation error: Failure when receiving data from the peer
I'm wondering what the cause may be and how to get around this seeming limitation?
Thanks.
Rob