Hello,
I own a Voyager select series from 2013 and I’m suffering from following issue:
Sometimes when I switch on the device the mod wheel shows no influence to the modulation buss. Only pedal/on shows some signal processing.
After several times of switching on and off both mod busses function proper. So but after some time mod wheel buss looses functionality again randomly.
I made a reset to all settings an checked if the mod wheel is broken but the encoder works fine.
It would be very helpful If anyone have an idea and maybe a solution for that.
Thanks in advance!
What OS are you using?
This description sounds like an hardware failure 
My first guess: A faulty TI chip.
The problem stated in the January letter only affects Minimoog Voyagers built between mid-2010 and January 2013 with the following serial numbers: Select Series 829-1724, Performer 2990-3445, Electric Blue 1506-2075, RME 1330-1925, XL 1-545, and Lunar Select Series 1-57.
…
Sincerely,
Michael Adams
President Moog Music Inc.
…
If you are the original owner of a registered Minimoog Voyager (any model) purchased between mid-2010 and January 2013, and experience any of the following issues, please contact Moog service …:
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• Mod buss no longer functional
…Thank you for your continued support of Moog Music.
Sincerely,
Michael Adams
President Moog Music Inc.
In the last 20 years I never had a problem like this. And I had every available OS from 2003 till today (v 1.2 to v3.6) installed in my Voyager. So it is for sure not a problem that will be solved by a software update.