So my S2 is now shutting down constantly...  Every time I have to remove the jumper pin from the PSU cable and put in back in order to power it back up, but it will only stay alive for maybe 30 minutes before it does it again.  The first time this happened I actually had to re-flash the SD card to get it up and running.  I even tried removing one of the hashing cards to lessen the load on the power supply, but that doesn't seem to have made a difference.

Is this a known issue?  Is the power supply just toast?  (Is it even worth it to replace at this difficulty?)