I think I have the same problem with my setup (LibreELEC (official): 11.0.1 (RPi2.arm), kernel 6.1.19).
I would like to implement your solution, e.g. power off and on the usb port to which the 'MyGica Mini DVB-(T/T2/C) USB Stick T230C v2" is connected.
How can I install the uhubctl utility on LibreElec? Can you give me some directions?
On my setup the problem blasts almost every day
No idea how you'd install uhubctl on Libreelec I'm afraid. I have my tvheadend (server) setup on Arch Linux.