Hey the sole reason of creating this post is to address the motherboard issue which many users seem to be suffering from.
Personally I don't own a Zenfone 6(I own a 5z).
I've seen many people here on Zentalk and people on the telegram group of Zenfone 6 reporting their devices constantly rebooting (4-5 times a day),and their apps crashing frequently.
Now I don't know if this is a motherboard thing or software thing but something in the updates is triggering the devices to die or crash constantly maybe a hardware/software thing.
Many users faced this on different firmwares so it's not related to a particular firmware,this means that the issue someone is facing on one firmware can be triggered on someone else's device on different firmware.
If this is a global and rampant issue on the device Asus should consider calling back the devices and changing the motherboards or whatever is causing the devices to die
On the telegram group I saw a guy suffer this same issue (he changed his mobo from SC which took like 2 weeks) then the phone started crashing like in the expanse of the next 5 hrs again .
That was just a little info on the issue hope Asus does the right thing here.