That happened frequently this week. I think I remedied it on my end by opening the Command Prompt and typing:
ipconfig /flushdns There's a single space between the g and the / It hasn't happened again since I entered that phrase.
Backups are completed every day at 0400, so that will certainly cause these. If they happen throughout the day, that's still server-related, but not related to the backups. We've been working to minimize these, as much as possible. Keep reporting if they persist or get worse, please.