Cell phone harmonization sticker

My phone's EMF's were messing with my vehicle's central computer. Any time I was using data to access the internet while my vehicle was idling, the computer would start throwing random error codes and then would die. After putting the sticker on my phone the problem completely resolved. I went six months without problems. I recognize that correlation doesn't mean causation but one day I was getting into my vehicle and the sticker fell off my phone so I put it in my pocket intending to glue it on again later. I started my vehicle and then had to check something on my phone. The vehicle immediately started throwing error codes and then died. I replaced the sticker and again the problem hasn't happened since. Coincidence?