This only happens when I switch between Google Accounts on Chrome.
When I log out from one account and log into the other, I usually log into Gmail by searching "Inbox" on my Chrome address tab. What happens is that my first search history suggestion provides my old account address while i am actually logged into my new one.
This seems to cause some hiccup as Chrome tries to enter my old account's Gmail for a few miliseconds, but it detects i am in the other one and something seems to break.
Don't want to jinx it, but the problem seems to go away when I delete the cookies, cache and only log into one Google account.
