Could also try going into your router settings and renaming the 2 wifi bands,that way you can choose & you should choose 2.4 Ghz one,they'll both still use the same password.
Also maybe check if the tvs software/firmware has an update
As for the Stick,you would be able to sideload lots more apps than you can get for your tv & depending on the age of your tv,it would be a lot faster.