said by flwpwr :
neighbor set up wireless on same freq and channel, now you got interferance?
Could be a million reasons, really, like you bought new wireless phone or wireless phone [land line wireless not cell] and it switched channel to interfere now, etc. Or gateway could have firmware updata coming in, who knows. Maybe your gateway is rebooting thus you loose the wireless while it is, millions of possibilities.
Do you have anything else but your phones hooked up to wireless and if so did it loose wireless too?
As I stated, I had no problem with my laptop, desktop wireless and internet TV connections. Possibility is your first sentence, "neighbor's wireless". I show that connection but it is secured and password protected. Both phones are a year old.