It is one of the most current demanding processes. The 38-pin versions, although there are many variants, can be problematic. (please post a link to where you got it from)
Most likely cause is that the 3.3v regulator on the board does not have enough heatsink or the output capacitor for it, is not properly connected anymore. It may of course just have overheated. You can consider to provide regulated 3.3v to the processor yourself.