Getting singed out continuously by using proxy

My stupid country has blocked BHW (for God knows what reason) and I have no option but to use Proxy to access it.

The issue is that I am continuously getting signed out (sometimes within 2 minutes) and I have to login again & again. For e.g: I have logged in more than 5 times within last 10 minutes.
Please help me resolve this issue.

BUMP.
Still facing same issue.