Strange Happenings

I own an upgraded white macbook that I bought for college last summer just after the first intel macs came out. It is hands down the best computer I have used, but it has been having some troubles lately. The first (and worst) of which is the random reseting error. The screen fades out and a little gray box pops up saying, "You must restart your computer now." in multiple languages. It seems to happen the most after a new update from apple or when I am low on hard drive space, but it hasn't happened recently.

The other problem that I just experienced is disappearing bluetooth. I use bluetooth to sync with my PDA so it is somewhat important. Yesterday I turned on my macbook and the bluetooth icon had a squigley line through it, and when I clicked on it a message said, "Bluetooth not available." I went to system preferences and the Bluetooth preference pane was gone. At this point I rebooted and everything was back to normal, but it was quite strange experience. I'm hoping that it was just one time thing but you never know...