amp/sub help!

[843Powerstroke]

i have an arc 500.1 amp and i arc 10 sub. The amp has incredible numbers on it. I installed the system in my truck and is sounded great for about a week or so. Well just the other day the sub started playing at just low volume and when i turn it up it quits. The amp with blink red and green. But i have hook another small 12 up to it and it plays, i also hooked another arc 12 up to in and it had the same problem with it cutting off. I know a good bit about systems but i dont know the tech. stuff. I dont think either one is messed up because my last time driving it, it was working great then i cranked it the next day and thats when the problem started. Both are brand new. Thanks

[dereku]

check your grounds of redo them that always worked for me

[MeltonUnlimited]

What size of Amp kit are you running? Sounds like you are running too small of cable and your amp is just overheating.