Buzzing, Pops and Fizzy Distortion PT 12
 

Running PT 12 on my PC icore7 with 16gig Ram and Windows 10 Pro using a Digi 003. Suddenly I cannot record a track without Buzzing, Pops and Fizzy Distortion. I don't hear it while recording via the monitors but always on playback. (Doesn't matter if its via Analog in or SPDIF)
This has just appeared over the last 2 months. Can anyone offer help?? About ready to abandon PT and go to something else. I've tried everything I can think of with no joy!!