Still sounds pretty mysterious to me. This kind of event is rare, and the source of the interference is (currently) a mystery. I’d love to pop by with a HackRF and directional antenna if I lived anywhere near-by!
Even at my car dealership this is a common problem. A couple hundred cars with the same keyless entry system parked in the same lot. All those cars are actively scanning for their key fob, which causes all sorts of RF collisions. I've gotten used to having to use my physical key when picking up my car at the dealership.
My bet is that it's a cheap power supply, they are the worst offenders.
https://support.ce-check.eu/hc/en-us/articles/360008642600-H...
> In 2008, a logo very similar to CE marking was reported to exist and alleged to stand for China Export because some Chinese manufacturers apply it to their products.[14] However, the European Commission says that this is a misconception [... ...] despite the Commission's assurance that it is without foundation, this urban myth continues to be available on many websites.
>The Commission ... considers that the mark [China Export (CE)] ... constitute the CE marking as foreseen in the European legislation without, however, respecting the dimensions and proportions prescribed therein.
>...the Commission deems it necessary to establish a comprehensive Community legislative framework in order to ensure coherent market surveillance ...
>...It also provides for the legal basis for Member States to impose sanctions in the case of misuse which should serve as a deterrent.
https://www.europarl.europa.eu/sides/getAllAnswers.do?refere...