hi all the ICE sifus..

i'm facing this problem with my sub now.. sometimes it only functions at 1/2 power, sometimes i can hear the full power.. so i constantly have to adjust my bass levels in the HU when this happens.. normally, a bass level of -4 is what i use but i have to boost it up all the way to +8 to get the same sound when this happens..

then when it dissapears, i have to reduce the levels back to -4 again..what could be the problem? could it be the power to my amplifier that is powering the sub or a problem with the amp itself?

i noticed this thing started happening after i fixed the relay for my headlights.. could this be the problem then? maybe need another relay for sound system? i dunno...