[xj40] Digital speedometer and odometer problems

Hi
My XJ40 -89 digital speedometer is dropping to 0 km/h
intermittently during the ride. Also the odometer is halted and
showing latest numbers. The analog speedometer is however OK.
After some minutes everything works OK again.

Any ideas where to find the fault and how to fix it?

Regards
Steen–
Steen
Helsinki, Finland
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