bigbladelittleblade

Has anyone had any range issues with the DX7s, I recently bought one did a rqange test and it was OK, then flew my heli and it was OK, the second flight transmitter lost contact after around 150mtrs resulting in a crash, I then tried another range test and after 30 paces lost contact with the receiver. I am using a AR7000 DSM2 receiver. Looks like I will have to return it to Horizon Hobby. :-(