Modem always disconnects after phone being dropped

[kqlnut]

You could check to see if the antenna is still connected.

Will do when I'm back home where I have tools. But I figured in case of a loose antenna I might have no signal, but wouldn't lose the modem altogether.

cracks on the screen from wooden floor impact with rubber case ? strange

have a look at the physical switches on the back of the phone, they may have been damaged or moved to an unstable position and turn the modem on and off randomly

if the impact was indeed so strong anything can have gotten out of place or even the modem chip may has lost contact

of course if something else is short-circuited it can cause a power surge that restarts the usb hub

only if you are lucky enough you will find the problem

I think the drop was pretty unfortunate, I only had one free hand and the phone did some spins on the floor more or less face down, maybe it even hit the base of a lamp, not sure. There are two clear points of impact from which the cracks start.
Thanks for the advice on the switches. They didn't move though and toggling the modem switch doesn't help. I will take a look inside the phone later, but it seems strange that apparently the modem is attached and then disconnected just like when it irregularly loses connecition the other times.