Alexander: Don't miss calls because the phone didn't ring or vibrate

Q: My iPhone XS, now 26 months old, has a ringing problem, even though it's never been dropped or damaged. The phone often doesn't ring or vibrate when I receive a call. So, unless I'm looking at the screen when the call arrives, I miss it. But this doesn't happen on every call. A Verizon tech called me once and the phone rang, then he called me again and it didn't ring. The tech said he'd never seen anything like it. The only thing that temporarily solves the problem is to change ringtones, and that fix only lasts for one or two calls.