Re: intermittent wireless connectivity across a range of devices
It could be interference from a neighbour's wireless devices. If you haven't already done so, try turining off the automatic channel selection, and try different channels manually.
The channels overlap, so there's no point in trying ones next to each other. In practice, it's easiest just to try 1, 6 and 11.
You can get free WiFi analysers for Android and Windows (and perhaps others) which show how the channels near you are being used. But be aware that they are unlikely to show other wireless devices (such as baby monitors).