Although my Bolt is great when it is working, but I recently replaced the hard drive because I was getting the 4 flashing lights, indicating a hard drive failure. The new drive is working fine. But even before this, the box sometimes shuts off on its own, with no green light. This doesn't happen while I am watching tv, but sometimes happens overnight. No green light. I unplug it, wait 10 minutes, plug it back in, and everything is fine. Is it overheating? The fan is spinning…