No wifi after power loss

well, i just bought an E4200 and, by the way, was very hard to configurate. 
But the real problem is: if there is a power loss, both modem and e4200 lights up, but no internet connection is provided.
Even the SSID desappear. I trried to disconnected everything, reconnect by parts, but no success.
I wired  connect the E4200 to my iMac and the router was ok, configurated.
Then, i reconnect to the modem and all worked ok.
Now im testing possibilities and is i reboot the router, the net desappear and i have to try possibilities till it works.
My older router connected automatically, without a problem, but i decide to buy "the best" brand and its top product". Now im disappointed..
Twice i realize that if the connections drops out, i have to disconnect and reconnect the internet cable from my E4200...
Can anyone help me?
Im really crazy about that, caus im not a dummie at this things

Try to use a surge protector or a ups in that way if there's a power loss then the router or the modem will not automatically shuts down. For the stability of the router's internet connection try to check if the router's firmware has been updated if not update the formware, reset,power cycle and reconfigure the router's settings.

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