Ios 8.x wifi issue after update

I have been having intermittent wifi connectivity issues with my apple devices since upgrading to ios 8.x. I've subsequently updated to most recent version 8.0.2 but alas still having the issues of intermittent wifi connectivity issues (wifi works then drops without reason).
The baseline critical information is:
-Cable modem with direct internet connectivity of 20Mbps down and 2Mbps up.
-Home netgear WNDR3700v3 running latest version of firmware V1.0.0.38_1.0.31.
-Apple 5s, 5c, 5 and iPad min, iPad 2 - iphones running latest issue of IOS but ipads intentionally left back to prior versions for purpose of testing.
-Forced DNS servers to google servers 8.8.8.8 and 8.8.4.4
-Security perimeter policies in place prevent external unwarranted proxy attacks, pin hole attacks, etc. No outbound (internal to external) flows are restricted and only established flows (external to internal) are permitted.
Problem statement:
-Wifi will drop on all iphones using current version of ios causing devices to fall back to LTE or 3g.
-Reboot of netgear required to reset wireless settings for internal device usage.
-Cable modem never loses connection to internet and plugging direct into cable modem shows continued network connectivity.
-These issues never were experienced prior to updating to IOS 8.x
Question:
It would appear there is a wifi ios issue. Does anyone have any suggestions ? There are no firmware updates available for netgear given its age (2 years old).
I would prefer to not downgrade ios devices if applicable.

Worth taking a look here:
Why does iOS 8.0.2 not resolve the issue of WiFi connectivity with iOS 8 and the new iPhone 6?
22 pages and counting...

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