99 Dropouts

I have recently purchased the LR-16, and when it’s working well, I love the device.

The simple setup, easy-to-use menus are just what I need as a band member that also happens to be in charge of archiving (a LOT of) gigs.

I can’t seem to figure out what causes “dropouts”.
Some 4-hour (2 long set) shows have 0, some hour long sets have over 75.

I have tried changing the settings from 48kHz/16bit to 44.1k/16, and it hasn’t made an improvement.
I use “all pads on” for every recording, since I have had overloaded tracks (and I don’t have time pre-show to search for individual suspect tracks) from the SBD.

The external HD I am using is a Western Digital “My Passport Ultra”, 500GB. Formatted it, brand new out of the box, for use with the Cymatic.
model # WDBPGC5000ABK. This is USB 2.0 and 3.0 compatible.

This is my main question: **** What are the possible conditions that would cause dropouts? ****

It’s extraordinarily frustrating to walk off stage, knowing we played well, and have songs chopped into 50 nonlinear pieces. I can’t in good conscience record our shows without having an Audience mic at the FOH console for emergency backup. It’d be one thing if it were consistent problems, but so far I can’t figure out how to create/replicate the issues. It’s seemingly random at this point.