This is happening a lot in PT11.3.1, runing around 45% in PT, quad core i7 Mac Mini with Fusion System Drive OSX 10.9.5, recording to USB3 flash drive/SSD. It just spikes and error pops up saying remove plug ins etc. Buffer is at 1024. If I check Activity Monitor, PT is at 200% after the error and audio is crackling and garbled, have to quit PT and relaunch! I did run the Spotlight fix and verified mdworker and mds were not showing up in Activity Monitor, but that didn't seem to help. Any ideas of what else can be done? Thanks!!