We have a laptop with a 12 ports of USB hub, plugging to external LCD, HD, printer, keyboard, mouse, iPhone, etc.... It was working well without a problem for about 6 months till the monitor started blacking out. We figured it may be because of too many peripherals plugged to the USB hub so we unplugged the iPhone. And yes, it fixed the issue. But just today, several months from the last incident, the monitor again started blacking out. We then fixed the issue by unplugging one more peripheral -- HD.
We are so puzzled since if it is the USB hub's capacity issue how come it takes many months to act up? More importantly, do you know how to fix this issue?