Auto/Manual Tunning option disappearing from TZT16F display

I have a TZT16F and I noticed that sometimes in the Radar setup menu that the Auto/Manual Tunning option is not in the menu tree. I have tried power cycling the antenna/system, but I cannot seem to get this option to consistently be displayed. What could be/is causing this?
 
It sounds like the NavData window is getting closed sometimes. If you swipe in from the left towards the middle of the screen when on the radar screen and select the radar tab 1769812251037.png
 
It sounds like the NavData window is getting closed sometimes. If you swipe in from the left towards the middle of the screen when on the radar screen and select the radar tab View attachment 7016
I can access the gain, rain, and sea tuning functions consistently. I’m talking about the manual tuning slider that appears when you turn the auto tuning off located when you select [Furuno] >[Settings] >[Radar] located below Antenna height in the menu tree. With the system transmitting [TX] the option was there 1 day. The next time I looked for 2 days and it was gone. After I updated a couple charts it appeared again, and now it’s gone.
 
NXT is a sold state radar and doesn't allow for manual turning. Only the X-class radars or Magnetrons offer manual tuning abilities. Maybe you have two radars on board and switching between them?
 
NXT is a sold state radar and doesn't allow for manual turning. Only the X-class radars or Magnetrons offer manual tuning abilities. Maybe you have two radars on board and switching between them?
Johnny, Thanks for your speedy responses. The NXT is the only radar installed on the vessel. The option seems to be missing more than it is available, but when the option is available it does allow me to turn the auto tuning off and adjust the manual tuning slider. If this option is not supposed to be available for the NXT antennas would this cause any damage to the antenna, and is there a way to stop the option from appearing? or would it just be better to ignore it?
 
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