Volume/frequencies problem!!

Hi, I bought the Moog minitaur year ago and last time I went in studio for a recording session, I noticed that the volume was modulating, the wave was not constant…and it affects the frequencies..
I’ve reset the machine and turned off the LFO’S knobs, but the volume and the frequencies are still modulating and inconstant ..? why is that so?
I wrote to moog directly and they said they’d never heard of such a problem before.. I wonder what it might be.
Thanks!
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Is that with one oscillator only?