Warnings in Meeting stats - QoS

Almost all 300+ users are on version 6+.  All Remote.
Seeing a high # of Warnings for Meetings.
While we are trying to identify causes and remedy, are there any community gurus that have any tips?
Computers are all decent specs (mix of Win/Mac, mostly w 16gb+ RAM, recent models).
The stats on Warnings are about the same in the past as well... so not a new thing.