thanks everyone for replying, I went to customer support 3 days earlier & when I explained the problem to them they couldn't answer why this was happening or how to fix it so they offered me...

Region : Others Model : TL-WR1042ND Hardware Version : V1 Firmware Version : 3.15.7 Build 130923 Rel.55891n ISP : I bought the router in November 2014. It's working very well but the wifi range isn't...