I think it's not a problem in you hardware. It is something wrong with Cakewalk.
I also face to the problem. But I can give you some hint.
Before drop-out you have late buffer. Late buffer appears first. Then you have drop-out.
We definitely need some developer-level investigation.
BTW I tried with Reaper - same interface, same content - no problem.... I have also MixBus and it does not work smooth.
Moreover, I have problem when imported 19 tracks, and with FX off, WiFi disabled...
buffer.pdf