Something very wrong there - I had no issues with my micro iDSD BL and xDSD… and no issues with my Pro iDSD…
Do you have a Raspberry Pi to test with? Installing something like RoPieee which has a relatively up to date kernel? You’re only playing bit perfect, so not using high sample rates so the Pi would be fine for a test.
From CA Forum you know that your native DSD issue needs the SOtM kernel to be updated… that’s the solution to the native DSD static sound - it’s not a Pro iDSD firmware bug at all. You will see that the latest RoPieee version has this week patched native DSD support for Pro iDSD.
Stable release 2018/09/01 (160)
I wonder if these other issues are SOtM firmware related too… Testing with another Linux endpoint like Pi with RoPieee might help.