External MIDI stops working over time when used with fireface UCX
I have an RME Fireface UCX and am interested in using drama for liveset use as an octatrack replacement but right now MIDI on external gear just stops working after 10-30 mins. Audio inputs keep working but the MIDI light that indicates outbound messages stops blinking despite the sequencer still being active on the app. When the fault occurs the RME TotalFX app shows that the sound card is "disconnected" despite audio still working.
The only way I can then get MIDI working again is to quit Drambo and RME TotalFX, restart TotalFX and then Drambo. Then it works again for another half hour.
I'm using the last pre-M1 12.9" iPad with iOS 15.7.2. Unwilling to go straight to iOS 16 in case this causes fresh problems. Could use some help cos right now I'm 2k down on equipment costs and nothing works right.