I know i posted about this months ago, but after fixing the problem... it's back. As a background, i've been running my car computer in its current form for about 3 months. it ran 2 months very smoothly, rarely a lock up. about 1 month ago, i added a powered USB port and ran the power off of an molex power cable. I also added a bluetooth dongle. Well since then, it's been locking up every so often. before coming to the forum about it, i wanted to run through everything i could and gather as much info as i could, so i started logging everytime i used my car and when it locked up. Well after a week or two of this, i noticed that it only seems to lock up on my afternoon drive home from work. This is about a half hour drive. It never locks up in the morning or on short trips to the store. i started thinking maybe it was a heat problem because its warm in the afternoon. I started running the AC on my way home... made no difference. There's two fans in the case, one in one out. I ran SpeedFan a few times to see if i could figure out the temp. In morning it runs between 47 and 49 degrees C on teh CPU and 36 in the case, but in the afternoon it was between 48 and 51. NOt much difference. I also removed the bluetooth device to see if it made a difference, and it did not. Also, if you saw my post about a switch, i started turning of my car computer and turning it back on when it locks up. It would boot up, but most of the time lock up as soon as it was going for a while. This also made me feel it was a heat issue. could it lock up because of a 51C cpu? i read other threads w/ people running theres into the 70 degree area.