OpenPHT freezing with new headphone amp
I'm having a problem with OpenPHT / PHT, I run a triple monitor setup and I recently got a new headphone amp a JDS Labs Element, now whenever I alt-tab / click back into Plex it freezes / stops responding for up to a minute or just crashes this happens both on the menu and while watching something. I originally had a JDS Labs Objective 2 amp which worked fine with Plex (both amps use the UAC 1 drivers) but for some reason the Element is playing up on my main PC, it works on my tablet and other PC's just fine (all Windows 10).
I've gone through and uninstalled both Plex and the drivers, cleared all remaining Plex folders and deleted all registry entry's but it's still doing it when I reinstalled everything. I also run Voicemeeter to split my audio for recording gaming, even with that completely uninstalled so it's just the amp it still does it.
My main PC is running Windows 10 Enterprise 64bit LTSB, 3570k @ 4.5GHz, Asus Gene V, 16GB Corsair 1600MHz RAM, couple of Samsung SSD's, AMD 290 GPU, monitors are 2 Dell U2414H's & an Asus VG248QE.
Any ideas why this could be happening?