Exact same thing mine is doing. The clock is always off.I left it on overnight, and when I woke up this morning, it was locked up, and scalding hot. Hottest I've ever felt it get. I usually run one of those plate fan thingies underneath of it to try and pull heat away from it, which seems to help it, but not lately.
If it turn it off for a little bit and allow it to cool down, it will work fine for about 15 min, til it heats up again, then it starts flaking out.