Yes, I have this problem but probably for a different reason. After leaving the site, my internet disconnects me and I need to log back in before posting or commenting. My internet connection is shared with a family that is hosting me where I live, so most of the time I connect through my 3G data plan on my phone. Probably for the better b.c I end up discarding more than half of my posts and comments and either decide to re-write them or get lost in a better topic.