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Focusrite Scarlett 18i20 G3
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Focusrite Scarlett 18i20 G3

USB audio interface from Focusrite belonging to the Scarlett 3rd Generation series

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Thread 18i20 gen3 audio glitches under MacOS Catalina 10.15.7 and Logic Pro X 10.6.0

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1 18i20 gen3 audio glitches under MacOS Catalina 10.15.7 and Logic Pro X 10.6.0
I've had my 18i20 for about 3 months and it was fine under Mojave and earlier versions of Catalina (I think), but recently I experience many glitches under light use in Logic Pro X. I used to be able to run a buffer size of 128 @44kHz, but now struggle with 256 under light use (1 track).

The Logic performance meter seems to spike so I guess it's a CPU/driver issue. The only thing I can think of that's changed is update to 10.15.7.

I have done all the recommended steps such as delete inactive network interfaces, remove other USB devices, optimal preferences in Energy Saver, different cable, latest firmware and software. MacOS Activity Monitor indicates no other processes hogging CPU or RAM.

Any help appreciated.
macOS 10.15.7, 6-core CPU, 32GB RAM