The Mi A3's journey to Android 10 has been one for the ages. The Android One phone went through several Android 10 bug-riddled builds before settling on a more tolerable one back in April. That build doesn't seem to be perfect either, though, as there have now been multiple reports of random reboots.
https://www.notebookcheck.net/Recent-Xiaomi-Mi-A3-update-seems-to-be-causing-random-reboots-fix-potentially-in-the-works.469419.0.html