Wonder if the pc is trying to run lots of background processes and is failing to stay in synch or keep the buffer up to speed (related to the recent DoS). Worth running it again with the processor busyness chart displayed to see if it is maxing out(the one with the green line on a graph). Maybe someone can advise if that display is accurate wrt Mach 3. I’m wading out of my depth so have headed back to shore!