Time Capsule with Double NAT status - Question.

Hi all.. would appreciate some advice.
I have a Time capsule set to DHCP/NAT.
I have a second Airport extreme connected to TC via eithernet (about 100 yards away) set to Bridge to further my signal on a big property.
I have several Aiport Expresses for Airplay only.
I recently called Apple and they told me to set my TC to DHCP/NAT and chose ignore.
I had problems with my computers connecting to the internet (they connected to my network, but not internet.  Or occasionally I would get errors on my MBP that said could not connect this IP address is used by another device).  It was sporatic.  Apple told me this was likely because I have 20-30 wifi devices in my house and my ISP is not providing enough IP addresses.  They told me that DHCP/NAT makes my TC 'be in charge' of these IP addresses.
I am using Frontier service.  Modem from Frontier is Netgear B90 - 755044 - 15.
When I set up this modem, I turned the wifi portion off.  And currently the wireless light on the modem doesn't ever blink, so I believe it is off.
So why am I getting the Double NAT error since my Modem appears to have the wifi portion turned off?
Thank you very much!

Thanks again Bob!
I called Frontier... they refused to show me how to put my modem/router in Bridge mode.  Hypothentically, if I did that, would that solve this problem?  Sounds like it would.  They said they won't show me how to do it because they use PPPoE or something and if I put into bridge mode I won't get internet access.  Is that true?  They only use bridge mode for businesse they said.
I never wanted a modem/router.... I wish I only had a modem! .  Maybe I will call them back and ask only for a modem.  Good idea.
Attaching a screen shots below.
If I go into My connection at the top, hit Edit.... no where in there is a bridge option.
If I go to that green Enabled one under VC's... where it says PPPoE, there is a selection to choose Bridge.
See below.
But I'm too chicken and I don't know if that is the answer or not.
Thougths?
Thanks again Bob!

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