Cirrus MRX-4 II making servos feak out?

im using the Cirrus MRX-4 II 4Ch FM receiver and it makes the servos sometimes go absolutely crazy. sometimes they would work fine, other times not work at all, but most of the time, they would move very fast and it sounds like a bad dj scratching on a turntable. anyway, is there a way to improve this rx so the servos respond normally all the time?
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