This time, I think I have to disagree with Ice. (no offense bud!)
If the SWM 16 was hooked up wrong, you'd be losing 1 or possibly 2 tuners, not all of them. You'd also be getting a different error message "771B" or whatever the new number is.
The fact that you have to reset the SWM by unplugging the Power Inserter to get everything working again usually indicates one of the following problems..
1. Electrical - If the power Inserter is plugged into a power strip, try plugging it directly into the wall outlet. Power strips are notorious for causing voltage drops which the power inserter is really sensitive to.
2. Cabling/Connectors - You could have water penetrating into the cabling somewhere, which grounds out the signal from the dish (and the power to it), resetting the SWM after the water "disperses" can usually get it started again.
3. SWM or Splitter going bad - Intermittent loss due to a failing part.. if this is the case, then cross your fingers that the Tech gets there before it dies completely.
#'s 2 and 3 are the reason that the troubleshooting scripts for 771A/775 say to send a Tech even if resetting the SWM gets it working.. because even tho it's working now, it IS going to go out again, and will eventually die out completely.