Sorry nickgalati, I can‘t help. I have the same problem with Quantum 4848. Latest firmware on the Quantum, all updates for Win10 64. Latest Bios, THB-driver, latest IOS on 2019 IPad Pro. I‘ve tried the same measures like you. No success. I can be wrong but I guess it’s a UC Surface problem and not hardware related because Quantum 2 and 4848 are affected.
Gigabyte Aerius Master motherboard with GC Titan Ridge
Startech THB-adapter
IPad Pro 11“ MU102FD/A