"Brake Light Circuit" warning on check control

Normally when a brake light goes out, you get a "1 Brake Light Failure" message on the OBC. The Check Control light comes on and the OBC flashes the warning. You then press the "CHECK" button on the check control, and the "Check Control" light on the dash goes away, and the display shuts up except for the two pointers on each side.

But what I have going on is different. When I step on the pedal, occassionally I'll get a Check Control light that FLASHES at me, and the display says "Brake Circuit Failure". It also does not go away when I press the CHECK button, and the light on the dash goes from flashing to solid. It does not go away until I shut the car off. The warning pops up about 70% of the time, more often when it's wet/raining/humid.

I cleaned all the bulb sockets with a spray contact cleaner/anti corrosion agent. I also replaced a few of the old-looking bulbs and bent the tabs to make sure they make proper contact. All the brake lights work 100% of the time. They're all bright, and I'm pretty sure I don't have any bad grounds.

What is going wrong? Brake light switch on the pedal??
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