Hello all. I'm having some trouble with the drivers heated seat in my 2004 Yukon Denali. Seat heater will come on when the button is pushed but will only stay on for a short time, say one minute tops, the first time its pushed. After it turns off, if you push the button it will come back on but only stays on for a few seconds. I thought at first it was going out when I hit a bump but tried it in the driveway and same thing happens. Anybody had this happen before?