Belkin Model F7D8302 Range And Connection?

We have a Belkin Play N600 model F7D8302 v1 duel band router. It connects to the Blue Ray player about 40' away in living room and to ipad mini used about 15' in adjacent bedroom.I will not connect to the ipad when farther than 20' away anywhere in the house. I moved the router away from the computer as suggested in the manuel, still same problem. I tried to get support from Belkin and they said this is not listed as a supported product without buying something on their website. If I spend any more money, it won't be to Belkin as I have only owned this router 2 months now.