are you also logging in using an iNaturalist ID or e-mail? next time this happens, can you provide more information about the circumstances of your particular case? which page did you try to visit? was that the first iNat page that you visited that day? if so, in the previous session (look through your browser history), what pages did you visit in your previous session? did you clear history or cookies in between those sessions?
for what it’s worth, i’m not able to replicate the specific issue described and fixed in https://forum.inaturalist.org/t/im-being-automatically-logged-out-of-inaturalist/20332. so i assume that if there is a problem here, it’s a different problem.