OK just discovered something significant worth sharing…
Funny how I didn’t even know how to use this stuff Digitakt 1.11 : Bug reports and that limit turned out to help me 
As I added more and more tracks, I found that indeed the DT eventually got angry with me, and I hit a few exception errors. But, by limiting the tracks to 2 trigs, I have lots of head room again.
So if anyone out there is also exploring this, one way to get more bandwidth (and stability) is to use a short pattern length.
Best regards,
Gino