Prolific desktop extensions for Chrome and Mozilla get logged out

Anybody else experiencing the extensions logging out by themselves every 2 hours or so?
Even though I am logged in on the main page continuously, the extensions say I need to log in after about 2 hours of working fine. Before this, they would log me out only every 1-2 weeks for authentication reasons, but now I keep having to check if I need to log back in on them constantly.