USB disconnect sound and brief USB freezes whenever AVR switches on/off on Eaton UPS 5E 1600 G2 UPS

Whenever there's a noticeable voltage fluctuation ( typically when my air conditioner starts, wakes from standby, or when several neighbors' AC units switch on ) the UPS makes its normal relay "click" as it enters or leaves AVR.

At the exact moment that relay clicks:

• Windows plays the USB disconnect sound.
• All USB devices briefly freeze for around a second. ( both plugged at the back or the front ).
• Everything immediately starts working again afterward.

What I've tested​

I monitored USB events with NirSoft USBLogView.

If the UPS USB cable is connected to the PC:

• USBLogView shows the UPS disconnecting and reconnecting when the relay clicks.
• The USB freeze and Windows disconnect sound still happen.

If the UPS USB cable is NOT connected:

• Windows still plays the USB disconnect sound.
• USB devices still freeze for about a second.
• USBLogView shows no USB devices disconnecting or reconnecting at all.

Now normally, a two second usb freeze here and there isn't the end of the world except i do simracing and you can imagine how not being able to drive for 2 seconds here makes it completely unplayable. so i need to find a solution for this asap.

Any ideas or troubleshooting suggestions would be greatly appreciated.