The session time outs, even though you're still logged in, are a mandatory part of the added security we use on this site.
I think, but I'm not speaking for Ramsrule who sets up the 'tech' end of things and knows more about this than I do, that when we changed the reply area to come up on the read page rather than on a separate page, (the way it was), something went wrong with the short session time outs. OR, perhaps something else.. but whatever - the short session time outs do appear to be random.
- JamesJM