First of all, Musescore 3 has brought many improvements in percussion-land for composing music, thanks. However, occasionally, percussion notes (especially marching snare) will make a seizure/static-like sound (like it is trying to play the note several times over again extremely quickly) during playback (and after turning off playback will sometimes make the same noise when selecting the note) and will lag out the program, or at least mess up the current playback. The problem is usually fixed after about 5-15 seconds, or can be fixed by selecting a different instrument that isn't percussion, but in rare cases that instrument will make that noise too. The problem isn't permanent and the work can be saved and reloaded without trouble. I have played with the mixer and my own speakers, and those don't seem to be connected to the problem. Hopefully this problem can be fixed because it causes the composing process to take a lot longer.