touch devices work on micro-Farah differences in capacitance.
if they are on the same circuit as ‘other stuff’ - odd behaviors can be observed.
why after months? super tiny differences in grounding, wire / terminal corrosion / resistance - quite normally insignificant to the ‘normal’ circuit issues can make capacitance triggered stuff act weird.
not an ‘answer’ or a ‘solution’ - merely if some repair dude babbles on about a corroded / high resistance ‘connection’ - might not be BS.
our dishwasher would ‘die’ at the same point in its cycle . . . traced to the heating element ‘turn on-time’ - bad/shorting element, no?..
replaced heating element, no success. poking further revealed melted / fused / overheated wires/insulation in the metal junction box. yeah, installation screw-up . . .
basically, one cannot always trust the obvious cause . . .