BUG: Selection follows playhead randomly turns itself on
Even when not using features like Lumetri, "Selection follows playhead" will randomly turn on.

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Tom Perry commented
This is happening to me as well. It is very disruptive and frustrating. I'm running version 15.2.0 (build 35)
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R S commented
Additional Info - select follows playhead always activates itself (toggles on) after using or adjusting Lumetri settings.
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Matt Moore commented
I have identified that at lease in 11.2.1, the feature quits working when color correcting with a MultiCam. If you are working on a MultiCam and you click into the MultiCam view to select a different camera, when you turn the MultiCam view off, the selection no longer follows the playhead. If I save the project, close and open it back up again, the selection again will follow the playhead.
This is really annoying and affects my work flow. It seams that if since this is duplicatable it should be easy to fix.
I don't know if there is another scenario where selection follows playhead stops working, but I would guess it is a similar situation where you choose a different workspace or view and then change back.
I did read on another post that selection follows playhead does not work in the graphics workspace.