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I finally received an update -- 2021.4.13 -- and the problem is now resolved. Yay :)

UPDATE: I visited the San Francisco service center this morning. My service manager told me that this is a familiar issue and that the next firmware will fix it. It's indeed a software issue related to regen braking. He told me that the firmware should apply in the next two weeks. My Model Y is...

I caught it on video last night and shared with Tesla SC -- You can see the regen braking pulsing on the screen.

Update -- if I turn on "Off Road" mode, the problem goes away.... which makes me think that it's the traction control system that is causing the crazy pulsating brakes. I have a SC appt Friday.

Has anyone found a solution to this? I live on a steep hill (San Francisco) so I experience it daily! :-)

Has anyone found a solution for this? I live on a steep hill so it happens daily!

Tesla sent a field tech to fix my port. The tech didn't replace it, but sanded it a bit. I'm happy that they reached out to me and had someone out the following day. I detailed the fix (with photos) here -- Tesla’s short-term fix for late 2017 charge port issues

Be super careful with the WD40. I put it on a qtip and rubbed it on the 3 edges of the Y-shaped plastic guide. Mine still requires a lot of muscle to get it to turn green but at least it works for now.

I think you also want to lubricate the outer edges of the Y shaped plastic guide in the center of the port. A Tesla customer rep told me that it is the problem, not the outer edges. I'm curious if anyone else has tried this?