When my phone rings the flash alert flashes - even though I have the toggle turned OFF for that function. Took it to the store I purchased from and they could not make if work properly either. They "did" make it work temporarily by opening the back and taking the battery out and then replacing it. However, that fix lasted only a few hours. I have the latest version (15A) of the OS installed. I saw no mention of this in the description of the fixes contained in the 15A update.
Ty,
Bob