Wasn’t it Scotty Kilmer who warned us about cheap gas station chargers. The same should apply to power banks. Your problem is an RF interference problem. My problem was back voltage from the hand warmer getting into the car 12v.

I have three different Anker power banks and never had any issues with them.

Glad you found the source. My guess is it was most likely an Electromagnetic Interference (EMI) issue as @Rocko9999 mentioned. Poorly designed electronics can radiate all sorts of noise and/or cause weird issues (ground loops, etc) that will affect a RF receiver (and other ECU/electronics). Also possible the device was applying an unexpected/out of spec load when plugged in and affecting the power to the RF receiver/controller in the vehicle.

There IS a reason cheap power supplies/cables/chargers/etc are less expensive… (tho sometimes even the “reputable” companies design and sell crappy products).

PS - I’m a field sales enginner for a company that, among other things, specializes in EMC/EMI Testing (Electromagnetic Compatibility/Electromagnetic Interference). It’s crazy how many companies do an absolutely terrible job of electronics design (and don’t actually design/test their products so they don’t interfere with other things in the general vicinity). Not to say that paying extra is always worth it, but many times the extra cost of a more expensive equivalent option is a function of the $$ spent on the engineering & testing to make sure the product works properly AND won’t interfere with other electronics.

Super frustrating to chase down weird ghosts in the system like you had - kudos for the troubleshooting to find the source!

Didn’t see this post on page 2 before making the previous post…

Either way, guessing the offending hand warmer is in the trash/recycling bin by now!

I see this a lot, last time I had a TPMS light come on, I unplugged things daily only to find out it was a bad sensor all along!

I had a similar problem with a cheap, low watt USB cigarette charger adapter I used briefly for my iPhone. Everything worked fine for 3 weeks, then I could barely get the doors to lock/unlock. I had my battery replaced prior to this incident and couldn’t figure it out at first. Yanked it out and everything returned to normal.