Something similar happened to me with backpack zippers. It convinced me the phone is listening and serving me ads despite the technical explanations that it isn't.

I was walking to work and my backpack zipper broke getting off the elevator. When I got to my cube I set my phone on the desk and said to my coworker, "damn, my backpack zipper just broke!" 45 minutes later I was in a meeting and checked my phone and backpack zipper ads appear. I had never googled backpack zippers before, never seen backpack zipper ads. Literally the only proceeding thing before getting these was was telling my coworker that mine had just broken.