Sub cutting in and out

[Glock45809 0]

My sub will be bumping bass for parts of the song then it will cut out and nothing will be coming out of the bass. 

 

I have 2 subs, ones a 12 and the other is a 10 kicker compR. I have a 900watt pioneer amp connected to the them both, the bass will cut in and out, what’s the problem?? I’m clueless with subs 

 

[///M5 2,833]

Most likely a lot.  Need way more details on your setup, but running 2 different subs is a terrible idea.  Even worse if it is one amp