I had the same problem last week.

I had to change the suppressor - kinda like a filter diod which is placed under the front mat. It filters out the "aeroplane" sound on take-off.

And the reason for the amp cutting off? It is not able to handle the excess power coming out, thus overheating ... if this was fine previously, it means that you might want to take your amp to the nearest dealer to run an internal check as something has worn inside it. It might take about 1 week to get the results.

Grounding won't solve the problem.

Sorry.

__________________
... Kerry

126 tailed by a 203, 129 leading the pack.