5 clicks and your in the factory mode. Really easy to do. I don't know if I can post factory settings here, but here it goes. But don't try those settings if you don't know what you are doing!
In the factory mode, "Other" directory, change:
#43 to 140
#44 to 700.
Those are controlling the way the iris reacts from both ends of the luminance spectrum.
5 ip/sharp limit. Default at 255. I set it to 0
8 IP-VS 0 is off, default 1 is on I turned this to 0= off.
18 IP-VS LIMIT default 64 I set this to 0
19 IP-VS CORE 4. Set it to 0
No more ringing.