Airport Extreme fix

I've been having problems with the Airport Extreme Base stations in our house. Lately they just randomly "disappear" from the network. I can't ping them or see them with them admin utility.

I've been power cycling them to get them to work again but it's annoying.

I guess I'm not alone . The fix seems to be downgrading the firmware in the base station to v5.5.1. I'll try it tonight.