Hello. Yesterday I bought an iPhone 7 and I notice a terrible bug. When I talk on FaceTime, Wi-Fi shuts off and the call stays on my mobile internet only. Get to the router, again the same - it switches to mobile data. Please tell me whether this is a bug from my phone or from the software version - iOS 13.1.3 ? I also noticed that after changing my background and returning the old one, the old one seems much less colorless.