Was the replaced hall sensor new? or?
Check out GSAddict. He has a lot of advice on these units.
OM
Thank you all!
Got it to die again today and worked quickly to find out that the Hall Sensor (TDC) is bad once warmed up. 180º sensor was fine. I was also able to replicate this failure with a heat gun.
This is a newer Bosch HES with only 8,000 miles on it. Guess I'm going to try the Enduralast brand and see how it does.