Heres my problem

[Incin]

So I got my new amp yesterday, and at first it was hitting really good then the bass started to hit not as loud I looked an the right sub wasn't hitting like the other. Later that night on my way home after the subs only hitting for about an hour the left sub started hittin like the right one. So today I checked my fuses and all of them are in good shape, I trimmed the speaker wires thinkn they had fried somewhere on the ends and its still not hitting like it was before. Im running two RF 12" P1s the 4 ohms on a Boss audio CX950 with stock electrical with a 3 month old batt. Any suggestions on what could be the problem? until then im not going to have the amp on an try charging the batter just driving around.