Not only Xiaomi.

My ex Google Nexus 6P also have GPS problem. Heck, even the LG G5 also same. Sold both immediately.

Best with excellent GPS is Moto Z Play or Z2 Play. I've both, never lost signal. Moto Z sometimes go bonkers. Sold that too.

For my daily driving phones, only 2 always with me. Z Play and Z2 Play. Both either acting as hotspot or GPS.

I believe it MIUI issue, having the problem with Waze unable to fix GPS, im using Mi Max 1, after flash to Lineage the GPS issue went away. But if you still prefer MIUI then need to on and off flight mode only gps will fix location.

Samsung note 8 and note 9 with s8+ no gps issue. Used quite sometime di

My Redmi note 4 no GPS issue. Hmm weird. Always find my location immediately, even when I'm in a building. So far so good. I have some problems previously. After updating my miui 9.6.1.0, seems like problem solved.