Suddenly IDE stoped to recognise H7 COM port.
Also it could not reprogramm H7 via DFU.
H7 itself works fine: blue led blinks and virtual drive OK.
COM port does not opened in serial terminal, though in Device Manager displayed as normal.
If I try to sniff it via Tibbo IO Ninja, I got error:
Cannot start capture: The semaphore timeout period has expired.
DFU programming works under STM32CubeProgrammer.
Something wrong in hardware?