Hi Laresa
Welcome to BlackBerry Support Forums
Some time our BlackBerry device may feel warm say a long browsing session , playing games ,countinous download or while charging Or if applications runs in the background. If we press and hold the Menu for a few seconds, it will pop up a screen which will show all running programs in the background ,generally five will always there ( Home, BBM, Message,Phone , Browser ) you can always look if any other apps. are running in the background which is also responsible for device Overheat.
KB31531 : BlackBerry 7 smartphone may feel warm during use
Regarding reboot problem , have you recently installed any new application ? If it is then try Uninstalling that particular application which you think might be responsible afetr which this reboot problem appeared. But If you haven't Installed any third party apps and its rebooting on its own then it will be better to Contact your carrier to know if its a hardware issue.
Good luck.
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