jl audio hd 600/4 issue with rear left channel

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I have a strange problem with this amp, I know its the amp the rear left channel. Intermittently will play then gradually sound from that channel increases significantly to the point my speakers might blow. I know its not my wiring because i have it running active front channel for my tweeters and rear for midrange. I tried switching my tweeters to the rear and mids to the front and i'm receiving same issue with tweeters instead of mids. Its driving me crazy trying to figure out the issue it happens all the time sometimes within 5-10 min of playing. happens regardless if the volume is high or low. I did notice when the problem appears if i turn the gain up or down it fixes the issue. I'm sure its the amp any advise will be greatly appreciated.
 
seems as my problem went away after remounting amp to new location

it seems as my issue disappeared after relocating amp to new location i did notice a ground wire was on the casing of my fosgate 3sixty3.3 and removed that during relocating the amp to trunk floor. all seems fine now but amp doesnt sound as good as when it faulty.
 
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