21-04-2015, 04:39
(21-04-2015, 03:18)moolight0551 Wrote: It is the Chinese CH340. I will have a look at device manager next time it happens and see if the COM port looks OK.
I'm also using those Chinese CH340, and they work well, but they have a strange behaviour, or at least it happens to me. I can't have two connected on the same PC at the same time. After you install one of them, all the others are allocated to the same COM port.
Maybe your USB cable is faulty, or is too long.