I use Chrome on a personal PC on which I am the only user. I am logged into several websites, all of them with the "stay logged in" tickbox checked. Even so, very often when I go back to some of these websites, I find I am logged out and need to log back in every time. This happens even if the previous visit was recent; I suspect the critical action is the restarting of the browser rather than time elapsed.
Strangely, this problem happens only with certain websites (among them, booking.com, leo.org, oebb.at) but not with others (such as the StackExchange sites, or the Google sites such as Gmail/YouTube)
I used to think this is a problem with those former websites, but I realise it probably has to do with Chrome itself. What can I do to diagnose it? The only way I'd know how to do this is to disable each extension (add-on) at a time to see if any one of them is at fault, but that would take quite a while.
I am on Windows 10 and let Chrome update itself (currently at v77.0.3865.90).