Pumping output... when using wing..

Hello all

A problem I already see once in a while fo many years:

Cues which are played from the wing are pumping about 5% up and down on the HTP-channels.. same cue on the console is fine... also fast movements on the faders the cue resp. the HTP-output gets stuck.. same cue on the console: no problem...

This problem shows up, once in a while and disappears, as it comes.. really strange.
I've seen this on several consoles...

Anyone seen anything like this?


Aloha

michael
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