I’ve had this issue from the get go. Received my MBP in January, complete with the latest updates. Opened a few projects and it was obvious there was a glitch; old projects, new projects, it didn’t matter. Something wasn’t right. I was told I simply hadn’t configured it correctly, and then that I just needed a fresh install. Hours upon hours wasted. I then checked with developers, trying to sort whether their plugs were at fault, only to find that every developer couldn’t have gotten this wrong (I had reloaded plugs one at a time, and by developer, to see if there was any one in particular causing the problem). I also contacted RME as to the possibility of an interface issue. Nothing there.
Your point about the cumulative loading was what caught my attention - and it’s what has driven me around the bend. I have loaded projects with levels finally looking like they should, only to have the issue pop up within a few minutes of working on a session, having stopped and restarted playback: the system then overloading with all threads banging the ceiling; the playhead stuttering, trying to engage, not to mention the random crashes, sync error messages, overload errors and plugin compatibility error, time to quit, messages (with stock plugs and plugin manager telling me all is well). If I didn’t know better, I’d think there was a virus at play.
Apple support has been there for me, but clearly they’re as stumped as the rest of us, or they’re not willing to say. I trust that’s not the case. Couldn’t be more frustrated.