Amplifier cuts out

[HayZee518]

I have a karaoke mixer amplifier rated 50 watts per channel. It has three voice inputs off microphones. At one input I have a hisonic wireless dual mike setup. At the other two I have two dynamic hard wired mikes.
The levels are set at midrange.
Problem is that at certain periods - continuous input, the amp kicks out as in an overload condition. Zero input they reset and go back into overload with sustained inputs.
Doing karaoke I cannot have this. The "performer's voice" kicks out, singing. [8]
I had a mosfet amplifier 300 watts per channel that kicked out on overload, reset, then smoked it self. Fried the mosfet and associated wiring. Will the use of a bare bones power amplifier eliminate this problem or what?[^]

[LazyPup]

Sounds like you may have an impedance mismatch somewhere. Is the dual mic possible loading as two mics in parallel?

I would check the impedance from the preamp output to the main amp input

If your using coaxial cables, check the cable impedance too.
R1 x R2 / R1 + R2 ??