I hope Good sees this:
I just encountered another mobile bug hat I expirence almost daily. I have been on mobile all day. I closed my browser for about 30 minutes, came back and got the "invalid credential" error. I refreshed age and I was logged out, but my avi was still on the screen with the others, showing I was online but idle. I was not logged in from my laptop or phone at this time, and it had only been 30 minutes of inacivity. It wasn't that the avi just changed to an orange dot, I was completely logged out. This happens pretty much every single day if I leave the mobile browser window for 30 minutes or more
I have to log in twice around 3/4 the time that I log in on my laptop solely, so I don't think it's about the devices themselves.
I just bothered doing it and kinda stopped noticing after a few times, but it has been a fairly common occurrence as part of this website's bugs from towards the start of this forum's creation.