max motor temperature exceeded A5 / cable break of A5 temperature sensor

Hi everyone,
I am currently working on a KR16-HW kuka robot with a KRC4 control.
I just recently received error messages at the A5 motor that prevent the robot from working. you will find below the types of messages received.
I am a little experienced and I checked the wiring motor and connections A5 motor ; XM5, XP5, X30. the engine no longer heats. I restarted all but the error still exists.!!
who can help me please.
something else that I need to check to eliminate this problem?

thank you,
yes I know it's the motor return cable and it contains 4 pairs of wires (3 pairs for the encoder and 1 pair for the temperature) but I already check this cable; it is not damaged. I removed from the motor and I calibrated ax 5 and 6. the robot runs for a few minutes but still the problem returns.
are there any other things to do ??