H12pro radio and receiver bind problem

i bind several times radio and reciver. after 10 seconds of being on, the red light starts flashing blue and red. After 20 seconds, I connect the Key and Gnd pins, and the receiver starts flashing quickly. I select the frequency mach option from the radio. It connects. After 4 minutes, the blue light countinusly on, (the manual says two minutes). Now, when I turn the radio off and on, it connects, but when I turn the receiver off and on, it doesn’t connect. Do you know what the problem is?