I have:
Model: rb951g-2hnd
Firmware: 6.24
There are 3-5 wifi clients:
Mobiles (android, iOS)
laptions
wi-fi printers
Troubles:
Some times (period of 15 minutes) wifi network go down:
connection android is breaking suddenly....when phone is on no using mode...when press any button on phone activation of wi-fi come back....




what to do to wi fi will work perfect...

It is most likely phones power saving mode - it disconnects to save some battery life.