Hi joe77

Your issue sounds identical to mine, which I posted a thread here;

Fault - ACC Not Available error message displayed

I guess as it is a very short occurrence you maybe missed the fault message that appears on the dash. Did you notice a warning "ACC Not Available" appear?

I'm off to the dealer on Monday week to see what this is all about as there are other members on here with this similar problem then I'll report back.

Anyway, take a read and lets keep each other all posted.

Shane