I have 7440 with some strange usb 3.0 issues, under Win 10.
1st issue, when I connect flash memory or external hard to either port, it keeps connect and disconnect all the time, almost impossible to use it.
2nd issue, when I connect my phone - it do the same connect and disconnect thing. And if it stabilize, it isn't charging my phone.
I got issues with this laptop and got mainboard replaced, should I send it to RMA again ?