Xiaomi Mi A3 appeared on the market in July 2019, in some countries you can find this phone under the name Mi CC9e. It is a device with a pre-loaded clean Android system without MIUI overlay developed by Xiaomi, just like the other phones from the Android One program. The Android One series has the privilege of frequent system updates, but sometimes these updates contain some errors. This is the case with Mi A3.
Xiaomi released for the first time Android 10 update for the Mi A3 in February, but this patch was rolled back due to some bugs. The update was released again in mid-March, but users were still reporting bugs in the software. Xiaomi released the update for the third time on 8th of April, and as it turned out it is again flawed. This information was confirmed by Xiaomi's employees who directly communicate their customers on chat that the update due to software errors has been rolled back again. From user reports on the Internet we can learn that after uploading the update, the phone can restart automatically, and this is only one error from a long list of defects. If you haven't installed a new system update so far, it's best to wait a little longer and wait for another update.