The wireless microphone at our church cuts in and out while in operation. Anyone...

...have an idea as to why? We are using 2 four channel wireless transmitters (they are an of brand, not sure of the name) and we are using a Mackie DFX series 12 channel mixer with XLR inputs. All of the connects are mated correctly and power is applied. The speaker's voice will be fine and then cut out for about one second and then pick up again. It is sporadic, occuring about every 5 minuets.
 
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