Re-enable Automation keeps lighting up

Live Versions: All
Operating System: All

The Re-enable Automation button may unexpectedly light up as soon as Arrangement playback is started or when a set is opened.

The problem could be caused by:

Third-party plug-ins - some of them reset specific parameters when playback is started. This may happen for valid reasons, but could also indicate plug-in problems.
MIDI feedback loops - these are caused by certain connected MIDI hardware. The settings on the hardware and/or in Live can cause constant firing of MIDI data to Live.
Broken MIDI controllers sending erratic MIDI data to Live.
Some third-party plug-ins may have controls with auto-link functionality: if you adjust one control, then the other moves inversely. For example "drive" and "output" in a saturation plug-in might be linked to each-other.

By removing third-party plug-ins from the Live set one by one, find the problematic plug-in(s). Sometimes the issue is only present in one version of the plug-in. Try switching the AU and the VST version (if on Mac), or the VST2 and the VST3 version.
Get rid of MIDI feedback loops by changing the port settings in Live or the MIDI hardware settings.
Check the MIDI mappings in the Live's mapping browser or disconnect the MIDI controllers.
Make sure not to manually adjust any auto-link controls with automation, or disable the auto-link functionality.