GMC Suburban dome lights staying on

I have a 1999 GMC Suburban. Since purchase, the dome lights have been trouble. They remain on at random, can pop on in the middle of the night, etc. We've had a few of the door switches replaced (drivers, rear window), but have not been able to cure the problem. To get around it, we keep the dome override button engaged. Any chance that this is a known, systemic problem with this vehicle? Or most likely cause one of the remaining door switches failing?

Thanks
chris