Hi!
It's a definitive bug in the driver...
I installed a new system with Windows 7 Home Premium 64bit (Gigabyte GA-H87-D3H newest bios, Intel Core i7-4770).
CPU-Usage abolutely flatlined.... then the first and only thing i installed was the 3345-Driver.
Suddenly an increase on Core0 to 60-80% Usage, permanently! Sluggish System behaviour.
Processmonitor => Usage comes from interrupts/dpc
Uninstalled driver.... immediately flatlined again.
Installed older driver.... still flatlining and everything running smoothly.