The only way to be sure would be to put a scope on the inputs to the module to see if there was 'noise' present. However, most discreet modules have internal decoupling to get rid of unwanted noise present on the supply and inputs.

I would suspect that there is a fault with this decoupling - possibly why the module was available? Did you buy 2nd hand or new from a BMW parts supplier? If the latter, I suggest you send it back under warranty. If it's the former, do you have someone you know with a TV tuner that you could substitute your hybrid module into to see if they suffer the same symptoms?