maybe you could also use the issue template which i’m getting presented when creating a new thread in this “Server” category?
I think others are probably better able to help you if you provide more information about your environment (e.g. operating system, database, database version, specific database configuration). Those are all questions asked in that template which i think are asked for a good reason.
At the moment nearly everything is missing, even the ownCloud version you are using.
i think the “Log” part of the template is still missing and could give valuable information about your problem.
But from what i know / have read in the past shared hosting installations are known to be problematic with ownCloud because they are having limitations (like too small timeouts) or very restrict configurations which could cause such issues.