Hi there, I am having similar problems with the contribution. I have a 60.000 products store and I get the same type of Errors as people before. I've tried both the filesystem and the database caching system but in less than 24h I get errors (the same as people above). Clearing cache solves the problem, but that is not really a solution.
Anyway, I am trying to figure out how to disable the caching system by setting $use_cache = 'false', but I can't find the $use_cache anywhere.
I've updated from the Series2 version if that helps.
Any help would be appreciated because I intend to keep your contribution as it seems to be of great help, of course, except for the errors :)