Autel Explorer v1.1.7.38 malfunctions happened to me too, using Honor 8X Max, Samsung Galaxy Note 10+, Oppo F3.
But I had the worst using that Honor (Huawei) because during the flights, during the manual RTH, the app was completely disconnected from the Autel
EVO II drone. The disconnection was not caused by precarious contacts of the cable, despite this Honor having a USB type micro-B, which is very often less reliable and less stable than the type C.
With this Honor 8X Max the cable hardware was very stable, so it's a software problem and/or incompatibility with this smartphone (web disconnected, without SIM, Airplane mode).
I say this because the same thing happened to me a few days ago piloting a DJI Mavic 2 using this Honor dedicated to this use, as a monitor for drones and nothing else, as for other smartphones.
But this time with a much more serious problem.
During the return to my home there were repeated abnormal disconnections and each time in order to restore the video connection I had to try to unplug and reattach the USB cable and also restart the DJI GO4 app.
For a reason that is unknown to me, after the first disconnection with loss of the video live, the Home of the drone was also reset, so I found myself forced to pilot it manually in a desperate attempt to bring it back home.
Pressing the RC Home button, the Mavic rotated in the opposite direction away from me! I couldn't see it by eye, it was more than 1 km away, I saw it on the screen, when the app was back working, just for few seconds.
Unfortunately, this fact was repeated 5-7 times, without an understandable reason, plus late in the evening with almost black video and every time to restore the video I had to wait tens of seconds with the video connection which then lasted only few seconds then stopping again.
The battery was now very low, minutes of red warnings, before dropping to zero % and losting the drone definitively in a steep forest of a mountain, in an uncertain point because the last GPS position shown on the map is not necessarily the one where it stopped and fell or stuck, indeed it is possible that it made a last short attempt to return to the wrong Home, far from me.
At this point I decided to exclude for ever this Honor from use with drones.
I was able to drive the Autel home, first with the automatic RTH which had worked well on the RC and at the end piloting it in the right small spot of the Home when it was above me, without the live video on the app, during the flight, but not the Mavic 2 because of that unwanted Home reset during the first disconnection!
As regards exclusively Autel and the other two smartphones, Samsung Galaxy Note 10+ and Poco F3, the anomalies are exactly what you have had, are on both these smartphones, and seem to happen randomly, so not always, often in flight, rarely before the flight (often begining to try to switch from AF to MF) so it's to be sworn that they are caused by an app bug.
However, I have seen that it's possible to solve pretty quickly these functional block of the photographic settings that no longer respond, by closing the app and restarting it automatically by detachment and reattachment of the USB type A connector (RC side).
A bad additional bug actually happened only once to me, out of dozens with no issues, but a bit worrying, using the Poco F3 in which the web connection with SIM card was active.
The app (during the RTH piloting it manually) froze and even the smartphone seemed for some seconds not to respond.
Requested the automatic return on the RC which worked regularly, and with the left stick full down at the same time to descent the drone on a diagonal return, for less battery demand.
Then put the smartphone in Airplane mode and the app resumed working.
Very strange!
I was close to the border with another European country. I'm thinking: could this have been an issue triggered by roaming?
Don't know.
