EMI interference with various units certainly not unknown - L-1011 early on had a problem with the N2 limiting computer and HF interference - #2 engine would run down to flight idle when using the HF on certain North Atlantic frequencies - Another strange one too also on L-1011 - the L2 door lock solenoid would cycle when the electric hydraulic pumps were turned on.\
Very early on when solid state devices were coming in heavily we had things like stab motion sensor bleeping when pumps were switched on (some DC-8), Also erroneus outputs from transponder altitude reporting (DC-8 reporting itself at 42,000 feet).
Of course all the above and others I encountered were because of EMI sources being in close proximity to the units affected. still, with the sophistication now, no surprise if something like a very powerful VLF source could affect some computers.