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I use Chrome, both on PC and mobile. On PC I have to log in once a month, give or take.
Safari on Windows8 and Mac, Firefox on Windows8 work fine, no disconnect.

Safari on my mobile disconnects me each time.
 
Hmm... it has worked for over half a year. Now I am constantly getting logged out. Very weird.
This forum "feature" has a life of its own; hopefully it will decide to go pester somebody else soon. (I have luckily not had it for the last few months, but I used to have it all the time.)
And it appears everytime they fix it for somebody it breaks for somebody else.
 
Same. It's mighty irritating. If I log in, which takes double the time now that I get two login screens (sometimes a third, with a keep logged in button, but it disappears within half a sec!), and I switch tabs or go to another app, I need to log in again when I reopen the tab with the forum on...! Even if it's only been a few minutes...