Amps/ sub stops working at times

[Someone help me]

Hooked up a 12 in sub and amp. Everything is wired right and works great, about 90% of the time. The other 10 is that when im driving, the bass randomly stops. If I turn the volume up ( to like 40 of the 60 max) the bass returns and works fine again. Once it goes away and I just keep driving, not do anything, it will eventually come back on it's own 

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