I had a USB hub with 4-ports, but it is not powered by adapter. When I used that one, sometimes the machine does not find the connected USB devices on start-up. Sometimes it starts up perfectly, and then just loses connection without any reason, one or 2 minutes later its power comes back. I don’t know what is causing it, I have checked it, and it is showing no problem at all, can anyone suggest me to fix it. Do I need to buy a new one?
