It sometimes plays and stops playing one channel
If it's not the cables that you are using, it could be a number of things. Bad solder connection or corrosion on one or more ribbon cables. Maybe a weak return contact on a 1/4 inch female jack. Try putting a signal into the mixer and then inserting a male 1/4 inch plug into the different jacks to find out which jacks disconnect the signal when inserted. Even when they are not used these jacks tend to become slightly corroded and the signal is lost. You can give the jacks a burst of contact spray and 'work' a male plug in and out of the jack a dozen times.
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