the kill-a-watt I have is showing at 1115 Watts at the wall. Since just moving the box it has been shutting off quickly. The only other thing that I have done is update the firmware a while back and have it set at 196M and 725 Volts. I have a 18 gauge computer cable that showed some wear on one of the terminals. I ordered a 14 gauge cable to replace it. There's some dust inside, but other than that I'm not sure what is going on. Anyone have this problem. I'm close to retiring it anyway, but would still like to know if it works fine (and safe) until I shut it off completely.
What voltage and frequency were you running before? If you're getting 1115W at the wall then you're very close to maxing the PSU. (as are stock S2s though).
It's always been stock frequency and voltage. So I'm not really sure why its doing that. In addition, the watts start out at 1090 and then increase after thirty minutes to 1132. After this at some point it shuts off. I'm not an expert on electronics, but could this be something that would be caused by one, the 18 gauge power cable? Or dust in the S2? Or do you think it is the update I made to the firmware?
The things you've suggested as causes are all reasonable, although you can probably ignore firmware for hard shutdowns. It will either be PSU load, PSU overheating or your cable overheating in some fashion.