We've been tracking an issue specific to HP laptops and PreSonus USB Audio products including AudioBox and the newer interfaces such as Studio 192 released Sept 30, 2015.
We found that HP's implementation of Windows 8.0 on laptops made in the last two years does not allow for proper handling of USB devices to get enough current for proper operation. You may see a bubble pop up in the lower right corner of your screen saying that there aren't enough resources to use this device.
Updating to Windows 8.1 resolves this issue most of the time.
Many times audio systems PC users will turn off automatic updates to prevent new updates (usually released every Tuesday from Microsoft) can at times alter system performance.
However in this case specifically with HP / Compaq laptops made in the last 2 years, we recommend that if it came with Windows 8.0, to first run all of your available updates using Windows Update.
Then open the Microsoft Application Store and select "Upgrade to Windows 8.1" which is a free update.
Once 8.1 is installed, in nearly all of our test cases, the issue of non-connection, or problematic operation was resolved.
In some cases a BIOS update may be needed from HP, if you have a workstation class system such as Z series or if you're running an older xW series that had Windows 8.0 loaded on to it, contact HP first about doing a BIOS upgrade, then upgrade to Windows 8.1.
UPDATE: August 9, 2015
Windows 10 is now available as a free update instead of moving to Windows 8.1, consider upgrading to Windows 10 instead.