K8057 and K8059

hello…I bought a K8057 (2 channel RF receiver) and a K8059 (2 channel RF transmitter) and cooperate perfevt… But my problem is that i use this system to start 2 dc motors…and when it works then i cant stop it… Its doesnt odey to the order to stop…i must go very very close to receive the signal…i know that the problem cames from the small dc motors when works but i cant find a way to solve this…
If someone could help me in this cause i must find a solution soon…

Apparantly, interference from the motors swamps the receiver. If possible, you a separate power supply for the motors. Keep them as far as possible from the receiver. Make sure that the motor current does not flow through the on-board relays (use a second relay close to the motor).