lights don't work in auto position?

This is a 2000 Sable. I changed the sensor and the auto lights worked for about a month now back to the same thing they turn off then I have to go to manual drive for a while try using the auto again drive a short distance and they go out again. I am wondering if its the switch or a lose wire.
thanks for any help.

Did you check applicable trouble codes for automatic headlamps? Those are B-codes, anything?

Did you check applicable trouble codes for automatic headlamps? Those are B-codes, anything?

Sorry no I got my scanner but didn't get the programs yet to run the scanner and get the codes.
thanks for the reply. I hope to get the programs next month. My oldest grand daughter got married this month so had a lot to spend money on . lol