I didn’t have this problem with my laptop running SD2 a couple years ago, but I’m having it now. I’m running SD3 on a mac quad core i7 machine, High Sierra, and my USB is dropping out, almost like it’s going to sleep, but it’s at variable times. Generally around 5 mins, sometimes as long as 15.
I went into my barebones mac audio midi settings, and it sees the KAT3 kit, and it works with SD fine (thanks for the KT3 preset, much improved the mapping). I don’t have this problem with the midi mio connection, so I can use that, but I’d like the straight USB to work. I can’t find any settings in the KAT diong this. Maybe it’s that I’m not upgraded to Mojave. It could be anywhere in the chain. Anyone troubleshoot this before?
