Ouch, BK Hobby is seriously wrong here.
Thumb drives are as susceptible to corruption as the internal SD card is.
So possibly your drive already got corrupted which would explain slowness although there’s a number of other potential reason such as a constant restarting of bindings or some unfortunate setup to regularly change files, resulting in constant recompilation of rules (start with ‘top’ and ramp up system logging to get a view of what’s going on).
