I wonder if someone experienced this, too. For weeks or even months I tried to chase down the reason for occasional peaks in DSP load while working in Ardour. Normally load is about 50% in my case (i do not do recording on this machine, so I do not care about high latency), but then every some minutes the load suddenly got up to above 90% and an underrun occured. For the longest time I just ignored that. It was not nice, but not a showstopper for me. But recently I wanted to do some MIDI recording (on another machine) while this one was only doing playback using external sync, so I had to resolve that issue. I even installed another desktop environment!
It turns out that the Nextcloud desktop client was the problem. Oddly enough it even affected Ardour when I moved the project on another disk which was not in Nextclouds scope. The solution for now is to pause syncronisation while working in Ardour.
Did anybody have similar problems?
I’m on Manjaro Linux, which otherwise works perfectly for me.