Interesting.
This morning it worked perfectly, it held the speed without problems all the way to work (15 miles).
I used the switch to reduce and increase the speed, it worked great.
I even stepped on the brake to switch it off and then used the Resume function, not a problem.
I'll try again this evening to go home and will update tonight.
(knock on wood)

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1999 Porsche 996 Carrera Convertible
1994 420E - SOLD
1986 300E - SOLD, what a car
609 Certified