I have this pa system head with 300 watts rms total, a bass preamp di box BDI21, and my bass with some Quarter Pound™ for P-Bass® SPB-3. Im using all this with a 4x10 500 watts cab connected to one channel or speaker output 8 ohms of the head, i guess its 150 watts per channel. The 4x10 is wired series/parallel. 125 watts rms each driver 8ohms. The thing is that sometimes when im playing loud, the head or the drivers stop the sound for some seconds and comes back. 1,2 ,3 or 4 times or more. The PA head is new, is it an amp problem or am i doing something wrong? What do you think?