Yes, I tried everything, including flashing my router again. Finally, as I said in the other topic, I flashed dd-wrt (build 23919) and problem solved. So, it is a problem of TP-Link firmware for sure.

Hey, I have the same problem, I finally instaled dd-wrt firmware and problem solved.

Region : Argentina Model : TL-WR740N Hardware Version : V4 Firmware Version : 3.16.6 Build 130529 Rel.47286n ISP : VTR Hi, I bought this model three days ago in replacement of my old TL-WR642G v3.3...