Thanks Dave,
Another 'interesting' development is that on my R500, it does the scanning and settles on a channel, however, for some reason, when my iPhone (6s) connects to its 5G network, it "detects interference" and so channel hops and dumps the client.
This is the ONLY time it hops as i have tested it over the last few days, and with the very latest firmware released a few days ago and the logs show it in detail.
On my R600's everything seems to be ok and this doesnt happen. In fact, one of the R600's mainly has my iphone and Macbook connected and hasn't had this issue.
Edited to add...
I am also noticed that one of my R600's is seemingly having issues.
During the night agin, my iPhone will randomly associate and then disassociate, and from what i can see in the logs gives Reason 0.
I also now have the following: "wmi_peer_sta_kickout_event_handler:838 Kicking off STA *************** AID 1"
I have two R600's and the main one downstairs does not have this issue, as i am connected to it all day.