amp or sub probs

[Alpine2005 10+ year member]

i'm having problems with my kenwood KDA-929 amp and my Alpine sws-1242d sub.

the problem is that the sub cut off. but the amp doesn't turn off.

this just start becauce this is my first time i had the vol. way up.

i think it's my new pioneer deh-p860mp HU. because it has 6.5volt preamp outputs.

i had my pioneer hu for about 3 days and all worked great untill today.

the HU i had before had 4volt outputs.

SO WHAT DO YOU GUYS THINK IT COULD BE?

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