Odd electrical problem?

[BuLL]

2006 MT, ~6k miles.

About 6 months ago I was cruising along ~40mph, and DSC, TC, & KEY lights came on and the TAC & MPH dropped to 0 all at the same time. Just for a second, then TAC & MPH back to normal, then a bit later to 0 again. Happened two or three times, and the engine was running fine, didn't sputter or miss a beat. After a while the DSC light went out, but the other lights stayed on until I reached my destination.

Over the past 6 months it has happened again 3-4 times. Seems to usually occur on the first start/drive after it has been sitting a while. The other day DSC, TC, & KEY lights came on just a few minutes after starting and then 10 minutes later the TAC & MPH dropped to 0 4-5 times while crusing at 70mph. After I shut off the car and restarted it, everything seemed fine, and it didn't happen again for the rest of the day.

Any ideas?