Car Subwoofer Fading when driving??

[bjtheman1]

I've noticed recently my system works/sounds fine until I start driving, then I notice a lack of bass coming from my sub?

My setup:
Pioneer AVH-3200DVD -HU
Kicker DX500.1 -AMP
Kicker S10C Solobaric -Sub

This amp & sub I bought about a month or so ago, my prior sub/amp never gave me these issues.

My charging system checks out fine as well.

I have a feeling it's my ground but this same ground worked fine before, I even cleaned and regrounded it back in the same spot. Everything works great but when I start driving more I notice lesss bass from the sub?

[Samhain]

Amp going into thermal output regulation? Is this all the time or just when hammering on it?

[bjtheman1]

Yep, It was my ground. I found a chasis ground in the trunk I bolted it too. Now everything works fine.

Damn grounds!