Random mute/unmute or volume jump when turning encoder.

[acekrystal]

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Describe the bug
When rotating encoder on 1.4.7 Maxmix volume sometimes (~1 to ~100 times a minuted of testing) randomly mutes or unmutes, or volume changes to unexpected value.

This makes for a not functional and unpleasant Maxmix and chance of damaging your speakers or ears (I got blown away by a 100% volume jump).

Using an Arduino Nano Clone (with CH340C USB-Serial chip) I have problems where when rotating the encoder volume will be muted or unmuted at random, or volume would jump to unexpected levers, with potential risk of blowing up your speakers or ears (as the first almost happened for me >.<).

To Reproduce
Steps to reproduce the behavior:

1. Take a Arduino Nano Clone with USB-C (as I think all of them are clones and use the CH340C serial chip).
2. Follow normal installation of 1.4.7 Maxmix.
3. When everything is running as it should keep changing the volume until you see it jump random, or better, see it mute/un-mute.

Expected behavior
I expect the encoder rotation to only alter volume as expected from a volume button. And not mute/un-mute volume at random or change volume to random levels.

Screenshots
If applicable, add screenshots to help explain your problem.

System information:

• PC1 OS version: [Windows 10 x64 1909 ]
• PC2 OS version: [Windows 10 x64 21H1 ]
• Firmware version: [1.4.7]

Additional context
I'm busy trying to fix this issue myself as I have some interest in :

• Learning some coding and setting up the software side of a product like this.
• I bought a bunch of Nano's with USB-C as I really want to swap over to USB-C, So I have interest in fixing this issue also for future projects.