Stuttering effect while GarageBand is in background
I use iRig Pro Duo to connect my guitar to my MacBook Air 2018 (macOS 10.15.3). I use GarageBand (10.3.4) mostly as a practice tool, most of the times it's in the background, and i have iTunes or YouTube active with some song or video that I play along to.
Recently my guitar sound has been stuttering while GarageBand is in background, if I switch to GarageBand it all comes back to normal, but when I switch to another app guitar sound starts to stutter again. I've tried closing/opening GarageBand, restarting laptop, reconnecting my audio interface to no avail. MacBook is not overloaded while it's happening, I have GarageBand opened with 3-4 tracks and iTunes or Chrome with few tabs.
I had this problem few month ago, I hadn't changed anything prior to its appearance, struggled for couple of weeks and then it disappeared only to surface again.
Has anyone had this problem before?
MacBook Air 13", macOS 10.15