Car on or car off, when hitting a button on the touchscreen, like volume up and down, or selecting anything, I get a thud from my subwoofer, not real loud.  

Tried different ground points on for the headunit, I don't get alternator whine or anything.  Gains on my amps are excessively low as I have way more power than i need 3000wrms for a 1200wrms sub, and 150wrmsx4 for my mids and tweets.  

It is a minor annoyance, I but was wondering if anyone has experienced something similar with the nex units.

Try going into your signal level adjustment to turn down the signal by hitting the (+) & (-) .   This helps with that issue I’ve found.  You might be running way more watts than me to help the interference but worth a try to mess with it and see.   It’s in your menu 

Yeah.  I know.  Sry. lol. It might be a little late