On garbage collection, it happens sometimes within seconds and sometimes within minutes. It tends to occur in batches with lulls of 20 to 30 minutes. So, for example, I can login, navigate through 11 different pages to generate the problem, navigate 2 pages to generate the problem, and then not see the problem again for another 5 minutes. Does that fall in line with what you're thinking?
Actually, no. Garbage collection would destroy the sessions, so if they're only "temporarily" disappearing then load balancing seems even more likely.
I'm going to assume not, but are you using a non-default session handler? If for instance you were storing sessions in another database, or simply on a different machine then connections can fail. This would most likely only be set up through the set_session_handler directive I mentioned before... but you should also check your php.ini values for session.save_handler and session.save_path
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