Pi is not overclocked. Never has been. When the system is frozen I can not even ping it. Don't get any response then. Power supply of the pi's are both the same. Came from the same reseller.Going to keep an eye on the logs for now to see if I can find something in there. Thanks.
I am in a very similar position. I suspect my SD card is a fake, even though it came from a reputable supplier; I have yet to gather enough evidence to go public on the name of the supplier. I built a new SD card [form a different source] last night and am trying it out at the moment. I will report back.
JT