Neff cooker hood - fault developing


Occasionally, my Neff (D99T7N0GB) hood controls hang-up (ie buttons unresponsive, light and fan not working but display lit). Could this be a faulty control module? The details on my control module are as follows: 9000109686 A1192-006-01/c Serie-nr 012818 Software V5.2 Datum KW 09/06.

The odd thing is that if I switch the motor on first, then wait for a period (say a couple of minutes) before switching the lights on, everything is OK (it's the same if I start the other way around, ie with the lights first). The problem only seems to occur if I turn everything on in rapid succession.
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