Over the past 45 minutes to an hour, I have been logged out twice while I was reading threads.

Is anybody else getting this?

 

If you are inactive for a period of time (not sure how long, help Steve?) the site logs you out. I've had it happen to me many times. I do a couple of different things to avoid it when reading a particularly long thread or typing a long reply. Either hit "Refresh" every 5 minutes or so...or, since that won't work when typing a reply, I open 2-3 threads in different windows and either refresh them or go to different pages to keep myself active in on the site.

 

Im not any more inactive than I ever used to be

Maybe that is what it is, but Ive never had a problem with it on long threads before.