My Mi 10 T often restarts when driving in the car. First the reception is lost and then the device restarts a few minutes later. I then set Preferred network type to LTE and this only occurs rarely.
With iOS 4.11, it now only seems to lose reception and the device no longer restarts just like that. But I only get a network connection again after a restart.
With the current iOS 5.6, the phone no longer just restarts, but the cellular signal is still lost and the phone only reconnects after a restart. It is also not possible to deactivate/activate the cellular network.