HELP! Turn Signal Wiring Question

I have had AlphaRex headlights and tail lights for a year, no problems with hyper flash. In May of 2024 I got a camper shell installed and since then my turn signals hyper flash, almost always JUST when I press the brake pedal - though, sometimes they’ll do it regardless.

Thinking it was possibly weakening led’s in year old tail lights, I added resistors to my tail lights, and I guess it helped some? Maybe? But nowhere close to solving the issue.

Thinking it may be a fault in the wiring harness that was used for the third brake light, I unplugged the wiring harness for the camper shell and plugged back in the factory way. Still no fix.

Then I put my factory headlights and tail lights back in, but no dice.

After reading and reading and reading, I’ve about determined the signal controls in my combo meter may be starting to fail. If you guys were me, would you try that next? Watch the video here: https://photos.app.goo.gl/sCLZeDCCHpRpchjp7