just wondering if anyone else had an issue with one of their seat heaters, my driver side heater button lights up for a couple of seconds then turns off, but every now and then it stays on and works, checked connections but same condition persists! Anyone have similar?

 

Here is information on the heated seat system from the service manual. The dealer can further inspect as they will have the scan tools to diagnose issue.
DIAGNOSIS AND TESTING - HEATED SEAT SYSTEM

NOTE:Vehicles equipped with the heated seat option utilize a low voltage cut-off feature. This feature turns off power to the heated seat system anytime vehicle voltage is below 11.7 volts or above 15.5 volts. Be certain to check the vehicle electrical system for proper voltage anytime the heated seat system appears inoperative.
NOTE:If a Diagnostic Trouble Code (DTC) can not be verified, it is a good indication that an INTERMITTENT fault condition may be present. To help find an intermittent problem, sit in the seat in question and move around the heating elements within the seat while testing continuity. also wiggle the heated seat wire harness and electrical connectors while testing continuity.
NOTE:For complete circuit diagrams, see Wiring Information. Wiring Information includes wiring diagrams, connector pin-out and location views, details of wire harness routing and retention, splice and ground locations and proper wire and connector repair procedures.Before testing any individual components in the heated seat system, check the following:

• Check to see if the concern is isolated to only one seat. Operate the other heated seat.
• Check the ignition fuse in the Totally integrated Power Module (TIPM). Repair as necessary.
• Using a scan tool, check for any Diagnostic Trouble Codes (DTCs) related to the Heated Seat Module (HSM), If any DTCs are found, repair as necessary (Refer to 28 - DTC-Based Diagnostics/MODULE, Heated Seat (HSM) - Diagnosis and Testing).
• Check the vehicles battery open-circuit voltage and charging system performance. If the vehicle's electrical system is defective or weak it may not be suppling sufficient energy to operate the heated seat system.
• If there are no DTCs and the front heated seat system functions properly, but a heated seat switch indicator does not illuminate, the switch pod assembly in the instrument panel must be replaced (Refer to 08 - Electrical/8G - Heated/Cooled Systems/Heated Seats/SWITCH, Heated Seat - Removal) .
• If there are no DTCs and the rear heated seat system functions properly, but one or both of the indicator lamps in a rear heated seat switch do not illuminate, check the rear heated switch circuits and repair as necessary. See Wiring information. If the wiring is OK, replace the inoperative second row heated seat switch (Refer to 08 - Electrical/8G - Heated/Cooled Systems/Heated Seats/SWITCH, Heated Seat - Removal) .

 

That symptom usually indicates a short (overcurrent) in the seat heater circuit. On a 5 year old truck, I would bet the element in the cushion is kinked or about to break somewhere.