I posted a few weeks ago about turn signal stalk failure. Not the intermittent problem which has been reported before. Further testing revealed that both levers do not function. There is no function from either lever except for wipers on/off. There is no speed control, rear wiper, spray, etc. Steering wheel controls are preserved. Removing and putting back the turn signal stalk fixed the problem for several hours but it returned overnight. Any suggestions would be greatly appreciated.