|Not under warranty by a few months.|
I have tried with three different cameras, same result.
I have used this same tether setup in studio for at least three years, Toshiba laptop before this Asus and Lightroom from version 3.6 through current version, 5.2, this started just before I upgraded from Lr5 to 5.2.
Is same on three other USB ports, I keep a lexar USB for ready bost in one port.
I use Malwarebytes daily.
When it first happened, I sent my main camera, 5Dmkii, to canon, thinking it was the problem, haven't received it back yet.
I did get notification that there would be no charge for service, but no details from canon yet.
Have been alternating between canon 60D and 40D, since, neither will tether.
When I move the laptop from its rolling table to my desk, I hook up to a powered USB hub connected to three external drives. Have had some delays and other issues transfering large catalog files. Until now have not thought that the ports might be the problem.
I am not an expert user, I did go to power settings and have tried changing the USB setting from enabled, which it was when I finally found the setting, to disabled, and now back again.
Not sure whether the USB setting in power plans should be enabled or disabled, do not know what the setting does.
Sometimes, I can get one of the cameras to recognize for a second, but not long enough to actually get a shot off.
I have noticed that I hear the 'sound when I unplug a camera, but do not hear the other sound when I plug it in.
With other USB devices I hear the sound, both ways, pluging in is a different sound than unplugging.
Also, have had problems with the laptop recognizing the SD card when it is plugged in directly to the sd slot on the laptop.
Whether using a card reader or the slot, sometimes have to restart the machine and put the sd card in after the machine is completely,started.
One camera uses sd cards, the other two use cf cards.
Hope this information might shed some light.