HQ said that this can be caused by some oxidation on the cabling and that you can use oil-free dry cleaning spray to remove this from the cable connectors and sockets.
I must have inadvertently done this when moving and putting the sockets on/off and basting unit with air.
HQ: “If you are comfortable with disassembling the unit, like you must have done to change the battery, we recommend that you use a dry oil-free cleaning spray to remove oxide from the two connectors and sockets of the internal cabling.”
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