after the errors in version 1.3.6 I returned to 1.3.5 and now everything is stable!Well yes and no, btw sorry for the delay but I still haven't a really good way to move from sqlite to MySQL.
And as you've may noticed the RAM already decreased in version 1.3.6, well as a side effect the server stability has decreased as well.
So I think thats not anymore needed to test out