Updating the cPanel, in your case, won't fix your problem. That said, there are many things that might be causing the server to crash from a software standpoint including a process that runs out of control or uses too many resources. Make sure your kernel and other software is at the latest version and not corrupted, including Apache and/or Php modules. There have been a few kernel versions with bad drivers that can cause stability problems.
Ask your data center to check on your server hardware including the hard drive and ram. They can run different tests in that regard. On the less common side of things you could have the CPU, power supply, Ethernet card, or motherboard going out.
A few important things first:
Since your server crash on a regular basis, and if so, look at the cronjobs on the server.
Check your /var/log/messages file for the time before the crash and when the server boots up because you will sometimes be able to see an error. If something like the Ethernet card goes down you should also see it because the log files will still be writing, you just will not be able to access the server physically.
If your data center can't or won't help, you can seek professional help. Good luck!
