Chevrolet - Venture :: 2002 - Turn Signals Come On Solid When Hit The Brake

I have a 2002 (not 2001) Chevy Venture and recently replaced the left rear (drivers side) tail light circuit board. I replaced it with a genuine GM part, and when I connected the wire harness to the circuit board and screwed the tail light assembly back in place, everything works properly for say a half hour or so, then I usually get the fast blinking left turn signal (like a bulb is out). Also, both turn signals come on solid when I hit the brake. A lot of times, if I turn off the ignition and turn it back on, I'll get the Service Traction System warning and Traction Off lights in the dash. If I take the assembly apart and push down on the wire harness and put it back together, everything works well for a short time again, but it usually reverts back to the above. It seems to be a loose connection and I thought about some kind of loctite to keep everything in place. Someone also casually mentioned a dielectric grease, which sounds like it would be better.