Car stereo system pleaseeee...?

[DAT DUDE]

ok I have 2 12 subs 2 amps and 2 capacitors but for some reason lately when i turn it up loud it shuts off for like a few seconds and then comes back on usually when the bass hits hard.. I dnt knw wats wrong i dnt think its the capacitors and my battery seems fine and my altenator seems tobe wrking fine also help