Try using a tab refresher such as refreshthis.com or urlreload.com and set it to refresh every 25 seconds. That really sounds like the problem there. Hope this helps! ^^
Adding on.
Sometimes that tends to happen whenever I accidently log into another account or so or make a slight error with the username.
If what happened above doesn't help & hopefully it should, you could try logging on with your cellular device as well c:
But from what it sounds like, the refresher might be the way to go.
Hope something works ~!