the stop and restart usually has to do with httpd.conf change by cPanel (like adding/changing account config, etc). LSWS pick up the changes via (graceful) restart. It is not a problem and no need to worry.
your lsphp5 settings have followings issues:
1. instances 10 is not right. should set to 1
2. Max Connections needs to match with PHP_LSAPI_CHILDREN (500) if you have PHP suEXEC (Server => General => Using Apache Configuration File) set to No.