Starting from today I noticed that I get logged out from time to time at SE. It doesn't matter if I'm active or not. So normally I browse the web using Tor. Thatswhy "my" IP address changes every ten minutes and I assume that the login is connected with my current IP address. Is this true? If not what can be the reason for those logouts?
My ISP has dynamic IPs and my IP changes every few days (more if the router has spasms) but I'm not logged out.
They might do a whois on the IP to do an ISP or country-check but it's quite a lot of work for a relatively small problem.
It's more likely that your cookies are getting invalidated at some point or their servers just don't like you and keep dumping your session.