@Hank21 

Clients do not seem to have issues connecting to the AP.

Clients have throughput or no dataflow issues.

I have had the issue with the other APs, but mostly it seems like the one has this issue more often.  It is on 1.0.6 while the other two APs run 1.0.9 (what they were shipped with).  Would it be possible to get 1.0.9 to try to load it on this AP?

The pings that I've run are from the ER8411, SX3206HPP, and the controller to the management IP of the problematic AP.  I've tried with and without a management VLAN (no impact).  Nothing else on the lan or management vlan experiences loss.  After reboot of that AP the loss goes away.

I've tried setting the radios to low power and the issue hasn't occured, but at the same time only about 2 clients end up connecting to the AP.  So this might not be of any help.

I just noticed the ability to download diagnostic data withing the controller. I'll restore to factory defaults and grab the diagnostics when the issue happens again.

For some reason, clients wouldn't switch to this AP, so I disabled the other two APs.  There are now 55 clients connecting to this AP.  The problem appeared right away.
I ran a ping in the controller GUI. This is a ping from the 10G switch to the APs management IP.

This is ping from AP to the 10G switch

Most of the clients are 2.4G clients.

I disabled the 5G and 6G radios and the packet loss issue significantly improves.

With 2.4 disabled and 5G and 6G enabled.

  @ttocsr 

Further update.

With only the problematic AP powered I set the 5G radio tx power to medium.  2.4G and 6 are enabled and set to high.

I tried both of the other APs (individually powered) with 5G radio set tx power to high.  They don't suffer loss.