There are quite few drivers with that problem being reported, once the NIC driver goes into sleep or hibernation mode the driver dies and won't come back. So far the only way to fix this is to use a different driver or disable the sleep and hibernate settings for the NIC under power settings.
The logitech driver problems I have seen myself but it was with my G15 keyboard drivers causing a different problem. Once I installed the keyboard drivers I couldn't get a movie to start normally using WMP. I found a work around that involved playing with the WMP play button control settings but the logitech keyboard driver was definately the cause. I wonder how some of these drivers get past WHQL testing.