Hi said_elnajjar and welcome to the forums.
If you haven't already done so, please take a minute and read through the
forum rules.
1.) Games = processor stress = poor performance and heat. The HTC One X has the fastest processor available but there are limits. The game developers don't care if their app is stressing out your phone, but they are to blame (not the phone.) Complain to the developers!
2.) The "restarts" you complain about are most likely the Random Reboot issue that occurs with *some* HTC One X phones. If you restart your phone every couple days, as suggested, the Random Reboot should not occur. If it still happens, I would first try a Soft Reset:
- Turn phone off
- Remove back cover
- Remove battery
- Reinstall battery
- Reinstall back cover
- Turn phone back on.
If the Random Reboot still continues, consider doing a Factory Reset, but be advised to back-up all your apps and data prior to this step. There are several back-up type apps in the market.
Home > Menu > Settings > SD & phone storage: Factory data reset