Pro Tools was working great yesterday but not today...

Currently cannot play or record anything due to the "audio device buffer underflowed" error message.

I was finally able to record into my 2014 iMac after having buffer issues for months. I thought that the upgrade in OS had solved my problems but they have resurface. Any tips/ideas?

Using 003 rack as interface.

thanks,

C

Pro Tools was working great yesterday but not today...