ReadyNas 6.2 (NAS locks up entirely)

I installed the new beta (T1652?) and was able to boot, and get things running - for a while. In an effort to do some testing, I copied a users directory (about 225GB) to a local drive on my computer. It got most of the way through (down to the last 4 files) and locked up again. I did not reboot before leaving for work, so can't get the logs until later today. I will send them in - but would also look for things if someone could point out what logs have high value in this search. (I'm new to the innards of the RN104....)