Multiple PWM doesn't work reliably

[HaythamB]

Describe the bug Setting up 3 separate PWM outputs for RGB 5050 LED strips doesn't change duty cycles reliably, ending up with this in the logs:

octoprint.plugins.enclosure - WARNING - An exception of type RuntimeError occurred on log_error. Arguments: ('A PWM object already exists for this GPIO channel',)

To Reproduce Steps to reproduce the behavior:

1. Create 3 PWM outputs, map to any default GPIO pin
2. Try and change duty cycle normally, and then change another PWM duty cycle

Expected behavior Duty cycle should trigger an output, nothing happens, and log outputs the above for debug.

[HaythamB]

Tested this out further. Turns out it requires a restart of the OctoPrint service every time you change the PWM frequency. Working properly after restarting the service.

[RoCkHeLuCk]

I have the same problem, if I change any PWM plugin configuration to, and in the log the message "A PWM object already exists for this GPIO channel", just restarting to get back to work.