RBR750/RBS750 Hardwire issue with Firmware Version 4.6.9.11?

I recently upgraded to firmware 4.6.9.11 and noticed a strange new issue. I have a Polycom desk phone which is hardwired into my Orbi. It seems to be losing connection to the internet intermittently. The lights that show that it's connected to the internet keep flashing. This only started recently and the only change I've made was the firmware upgrade. My devices connected via wifi don't seem to be affected.

The problem seems to be worse when I made some changes to my onedrive account and, as a result, had about 100 gigs of uploads from my desktop (My desktop is connected via Wifi). During the uploads the Poly phone would have the issues (the phone is hard wired). I've uploaded and downloaded a lot in the past and never had this issue - I have 150/150 fiber internet. 

Wondering if the new firmware made a change affecting the QoS? I've tested this now a bunch of times and it seems to be the issue.

I have not yet downgraded the firmware to confirm that the firmware is the cause, but I am fairly certain that the phone would have quality issues/ loose connectivity ONLY when I was uploading a lot of data from my desktop.

Other routers have QoS settings that prioritize VoiP phones. I do have port forwarding and a port reservation set up on the routers that shows it as a VoIP phone already.

In theory, uploading a lot of data should not impact my phone's call quality... but again, this seems to have just started with the new firmware. 

I know there is another version that just came out but I wanted to check on this before upgrading or downgrading.

Thanks