After running for 1 day 2 hours at 900Mhz, I just noticed the phone was off.

I initially thought it was the battery that had run out but decided to verify this.

I took out the battery and placed it back in and it booted right up. The phone was very warm ( room temp is currently 34 degrees C ).

cat /proc/bootreason showed "pwrkey" but I know I did not accidentally press the power key.

The last thing I remember doing was downloading 6 new episodes in Gpodder with Tweego opened in the background.

It was running at 500Mhz (60% load when I last checked)

Have resumed the downloads and am monitoring closely.

NB
This is the first unexpected shutdown I've experienced since purchase.