new battery problem with amplifier

I am currently driving an 04 chevy avalanche 1500 Z66. Last Friday I finally had to replace my 4 year old battery.

I have a Kenwood KAC-606 amplifier configured to one channel mode with 300 X 1 max power output (150 X 1 rated power output) to one 10" subwoofer. I replaced my OEM 12V battery rated at 600 CCA with a new Autocraft Titanium 12V rated at 770 CCA. The next day I noticed a popping coming from my sub. When I examined closer I found that the power light on the amp was surging on/off every second or two. I wasn't sure what was wrong so I pulled the fuse on the amp to shut it off because I don't have a toggle switch.

When I replace the fuse, the popping starts again but it seems that when I move the amp around (not screwed to anyhting) to look for a problem with the wiring, the sub sometimes stops popping and the power light on the amp stays on continuously. Then mysteriously it starts "surging" again either immediately or at some variable time.

Any thoughts would be helpful as I have had this setup for several years in three different vehicles with no problems until I replaced the battery in the avalanche. Thanks in advance for any help.

I finally got around to checking my connections.

I disconnected everything, took the cover off the amp to see if anything was loose and it looked okay inside. I decided to replace the 30 amp fuse under the hood and the 25 amp at the amplifier just in case. I checked my ground which hasn't been touched since the install and it looked fine. Then i disconnected the wiring at the amp to the sub to see if it was related to that conection (seems very unlikely) and still....the amp seems to be powering on/off about every second or so.

Does anyone think it sounds like the amp is going bad?

Maybe it's coincidence but it all seemed to start when the battery was replaced. One word... frustration.