Had the same gremlin awhile back, but only one window. Didn't do anything, but one day it seemed to work fine. Has been fine ever since. Tho' I only drive the car once per week, while parked in the garage I keep all 4 windows slightly ajar (2"). Also, after pulling into the garage I'll fully cycle all 4 windows. As for your situation, you might want to try pulling a couple of the switches and clean the contacts (both the master driver's panel and each individal rear door switch). Or, purchase a new switch (they're not that expensive) and swap that one in and out.