Big problem with mysql on my server

[Spheerys]

Hi,

I use ispCP for 2 years now, on 4 servers, and it's work very well.
But since few weeks, I have a lots of problem on one server : MySQL stop several times per day !

I tried to read the logs, and find issues, but it's not very easy because :
- there are a lots of littles tech fits to tune the server
- the configurations files of ispCP is sometimes differents than a standard LAMPP server

This server is a little bit different than the 3 others ones : there is only one BIG website on it with a big database (and a second very small) .
On the 3 others, there are 40 smalls websites and that's work very well.

So I need your expertise !!!

Theses lasts days, I made handmade contrab to relaunch the mysql process if there is a problem, but I did it because I didn't had the time to solve properly the problem.
Now I have stopped the crontab, and I'm ready to correcting what is wrong.

I think the host server is powerfull enought, but there are only parameters of the mysql server to fix...

I'm waiting for the next crash and in few hours I'll be able to post you fresh new error logs...

If anyone has an idea to check configuration file, feel free to ask me...