Bug automatically logged out

i noticed this bug a few months back but it was only happening with one of my accounts -- now it's happening with all of them. it mostly seems to happen on mobile, i haven't experienced it on desktop since i first noticed the issue. not sure what other factors might be associated with it, but every time i stop browsing the site for awhile and then go back to the tab (at which point it reloads) i find myself logged out