Hello there,
New to the club and forum.
Yes, I can now join the 'this happened to me club' ~ yesterday!
Signs and symptons as above, attracting the horn blowing and rude gesticulations as it happened at busy traffic lights!
After crawling along using the tick over power and parking up and switching off, the problem had righted itself and a few trips later there has been no repeat.
However, it is daunting and you wonder if the gremlins will happen again?
It is a comfort of sorts to see hear that others have had this problem, and I also would welcome any ideas as to cause and even better, acure!