My RME has 2 midi inputs but this week one of the two stopped working.
 
So I bought a Roland UM One midi USB interface.
https://www.roland.com/us/products/um-one/
 
Sometimes, when I plug it in it works for a few minutes.
 
Then, for some reason, it will stop working. Sometimes, when I click the record enable it will not light red on the midi track.
 
The obvious thought is that I can't use a USB Midi Device along with my RME UCX, but I do use a keyboard with a USB Midi output and that works fine.  I really like using my fcb1010 pedal board long with my Roland GR20 when I play. I don't want to have to buy a new RME b/c one of the midi ports went bad.
 
Thoughts?

You should be able to use any USB MIDI interfaces as well as the RME’s audio and MIDI functions without problems.

As for MIDI interfaces, MOTU seem solid. I’ve been using one of their interfaces for several years. I’ve found M-Audio less reliable, at least in Windows. The M-Audio interface I had before the MOTU tends to scramble sysex for some reason.

The motu stuff looks good, but it's more than I can afford right this minute. I'll wait a bit and just use one device at a time for a while.
 
:-(

i'd send the rme in for service,
and deal with that, especially if it worked proper before.
 
shortest distance between two points.