WNDR3700v4 access point drops internet

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KSTinMB wrote:

I configured two WNDR3700v4 using the in-built Access Point settings, fixed IP at 192.168.210 and 192.168.1.215. They are hard-wired to the router, connected as per instructions to the first, yellow, Internet port.

All three routers are broadcasting the same SSID "ABC".

Most of the time the setup works as expected and when we move from room to room our wireless devices, Samsung Android and Apple iPhone, will switch over to the local access point without any manual intervention, picking up the stronger signal.

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Technically, your modern mobile clients are de-associating - at least from these legacy Access Points - to re-associate with another Access Point radio. On these old APs, clients tend to stick virtually forever, and don't seamlessly reconnect, not before the signal goes down to a very low level. 

KSTinMB wrote:

Sometimes, however, the access points says "No Internet"  and only connect again after being rebooted.

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This Ubee U10C135.30 is (most likely, can't find any other information at least) a pure cable modem only. It does not include any NAT router. 

What IP addresses are assigned to your Samsung Android and Apple iPhone ?

When you go to the Settings (on iOS), look on the SSID "ABC" (whatever is configured), and tap the (i), then scroll down the list to find the IPV4 ADDRESS. I assume you see a "Configure IP" on [Automatic], and below yiu find the IP Address, Subnet Mask, and Router (that's the default gateway IP address correctly speaking).

When you go to Settings (on Sammy),  look for About Phone view. There you can find the IP Address section, starting with the IPv4 address.

On both the Sammy and the Apple I don't expect you to see a 192.168.1.x or the like address.

I would not wonder (because you had configured the two Netgear APs to static/fixed addresses), your ISP does make two IP addresses available to the Internet connection on that ubee Modem.

Don't know at this point where you see a "No Internet" information. Could be on the two APs - as configured to fixed IP addresses - they won't be able to reach the Internet indeed.