Hello
I opened a ticket with Presonus since August 2018 on the SPDIF and ADAT problem with the Studio 1824,and there are still no fixes.
The problem with SPDIF is that you have to change the frequency each time so that the input and output are recognized. On ADAT the routing is not done correctly it is sent on all the channels without recognizing mono and stereo.
Please correct these problems.