That is not a bandwidth issue. It happens when your client (browser, app, scripting agent) is requesting pages at a faster-than-normal for a human rate. Your IP gets temporarily blocked. It is self-curing once the request rate drops to a normal level. If you are using more than one device from the same IP address they will all get rate limited.
The typical causes for this are, in no particular order 1) using a local auto-refresh at too high of a frequency, 2) a badly configured scripting agent, 3) a badly configured ad blocker or firewall that puts your browser into a loop, or 4) a badly configured advertisement that puts your browser into a loop.
Next time it happens send me PM the date and time and we will examine the server logs to see if we can identify the cause.
