CPU Spiking when pressing / holding a key

[biasrocks]

I've been getting CPU spikes when I press and hold a key on my setup.

This has been happening over a number of releases going back to 12.5 iirc.

USB Keyboard, which I've plugged into USB2 and USB3 ports with the same outcome.

When playing back a session I can press any of the modifier keys (CTRL, SHIFT, ALT) and it will generate a spike and cause Pro Tools to stop playback.

12.8 seems a little more robust in this respect, but will still throw an error.

Anyone seeing this on their rig?

Win 7 64/ i7 4790K / 32 GB Ram / GE Force GT 610

Mark