Unable to join network

I'm using comcast and cisco wireless router. For some reason for the past few day, i unable to watch youtube on iphone and netflix on my blu ray. The internet work perfectly but for some reason it became super slow, so i change the password to see if it make anything and it didn't. The problem is after i change the password, i unable to connect to internet with iphone. It keep saying "unable to join Network".is there a solution for this? How can i speed up netflix/youtube and connect to my iphone? Should turn off cisco and turn it on again?

Rebooting all of the network equipment is where you should start.

If that doesn't resolve anything, reset the Cisco router to it's factory settings (If it's SMB (Linksys.
Then set the wireless backup again with a new SSID and Encryption key.

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