WFS suddenly forgets the key

Hello, everybody.

after I have the (R)Audi back in the yard and the gear oil change is finally done today suddenly comes a new problem.

History:
I thought I was going to work with the bitch today and had no problems until I parked in the parking lot. Because of possible rising temperatures I had tilted/opened the GSD.

After work, I got in and started. Immediately after that, the engine went off again. WFS symbol glowed and it was not to be done.

God be slim I always have a spare key with me and this one worked. At home I tried the other key again, but nothing went on.
So re-learned and the engine ran again.

Error code (17978/P1570) was set to 2 STGs. They're deleted and tomorrow I'll read it again and see if he'll come back.

Question(s):
Is that maybe that infamous wire to the reading coil or is that shit going deeper?
I'll check the contact for sure. But don't really believe in a contact problem.

Can I reset the WFS with the VCDS-Lite version?

In 3 weeks the bitch is supposed to start the holiday trip and on such trouble I really don't feel like it.