If your contacts are on the pc you should not lose them. Do not know if you sync to outlook or palm desktop but that info should stay just not new contacts you have added after sync. You may want to manually add them on your pc.
Hard reset is you pull the battery , and hold the power button down at the gray screen. you should see an option to erase your data by using your nav key and selecting yes or no. (At least that is how I remember it.)
Use your phone (calc since it would reset) and see if your problem is gone. If it is starting syncing things back one at a time testing the device between syncs for resets.
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Plunker
Just trying to learn and talk at the same time here.
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