I have a 13" mid 2012 MacBook pro running Catalina, 16 Gb RAM, dual core i7 and a 1TB Samsung 860 EVO SSD that I recently installed. Also I recently swapped the optical drive for a 2Tb HDD using the OWC data doubler. I use VLC to playback from an external DVD player through a USB port. I have used the internal superdrive that I took off on an enclosure and several other external optical drives. They all work fine except when I unplugged them which causes my computer to display an error on a gray screen and then I have to reboot it and it generates a report. This only happens with the DVD players and never with any other USB connected devices. I have tried resetting SMC and using a USB hub and still get the same problem.