GPS: No Satellite Reception

The GPS on my LG V35 has completely stopped functioning. I've verified this with the GPS Test app, and done a phone-beside-phone comparison using GPS Test on both. Score: - Test-phone (Galaxy S10): GNSS Status=3D Fix, 29 satellites in view with 23 in use. - My LG V35: GNSS Status=No Fix, 0 satellites in view. **History**: Bought LG V35 in early 2022, pre-rooted (Magisk), Android 9. Phone worked flawlessly (including using Waze regularly) for over 2½ years. Then, a couple of months ago, Waze started losing GPS for minutes at a time on regular routes; then losing it for whole days; then permanently. Throughout, my wife's Waze worked fine. But then we traveled to Florida, and, weirdly, Waze worked again on my phone while we were down there. Returned to NY five days later: GPS gone, no satellites. **Tried**: every remedy recommended for "GPS fix," "no location," etc., including clearing data of Location Services, and following GPS Test app's recommendation: shutdown phone, go outside, power up, Clear and Update AGPS. How does one even approach a problem like this?