Infinite Mute is loft when button mutes and unmutes

[RobertLRead]

Describe the bug
Mute becomes infinite but is reset with mute button
Short Summary of the expected behavior:

After setting the mute duration to infinite, I expect to be able to mute and mute on.

Short Summary of the buggy behavior:
When I mute and unmute, the mute duration has been set back to 5m---I wanted it to stay infinite!

To Reproduce
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Expected behavior
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Hardware description
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Test Equipment
Model:
Serial Number: US0007

Additional context
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