Check fuse in amp, then adjust the gain.

The amp is overloading for some reason. Try removing one speaker, your impedance might be too low for the amp and it overheats.

if the speakers are all hooked together ( 3 and 3 ) then the speakers will look like 8 / 3 = about 2.7 ohms per channel. it is doubtful the amp will drive them for long without quitting. The best suggestion I can think of is another 3 pair of speakers, add each speaker in SERIES with one of the existing speakers. Now the ohms are 16 / 3 or about 5.3 per channel. the amp should go for that. Another solution is to trim the speakers with resistors to meke their values higher , but you will be wasting some of the power in the resistors instead of hearing it. Another way is to put one of the 3 speakers on each channel in series with the other 2 in parallel, then the ohms for the 2 in parallel is 8 /2 = 4 plus the one in series is 4 + 8 for 12 in total. the amp should drive this ok too. be aware that the 2 speakers in parallel will not sound as loud as the one in series. ( if you took the sound pressure of the 2 in parallel they would total the same as the one in series, but your ears do not work that way :)) Yet another option is to use 2 speakers in series and put one speaker in parallel with them. the net ohms for that would be between 6 and 7 ohms, and again the 2 would sound different than the one. So there is no easy fix for that one - - its a matter of which option you can live with easiest. be careful when wiring the speakers, observe the polarity of them to avoid cancellation. series connections are like batteries - minus to plus. parallels are plus to plus and minus to minus. AND the one speaker in series with 2 sets the max power - - 80 watts ! Parallel watts add, series is "the smallest watt" rules. Not precisely, but the math gets messy. GOOD LUCK !