RW[5.15.15]Profinet system failure

MRGREEI

Options：
645-1 French

709-x DeviceNet

709-2/709-5 Master/Slave Dual

711-1 PROFIBUS DP m/s

888-2 PROFINET m/s SW

608-1 World Zones

613-1 Collision Detection

623-1 Multitasking

630-1 Servo Tool Change

635-5 Spot Servo Equalizing

Weld Timer Configuration Options

709-x DeviceNet

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Profinet bus unplugging the network cable will directly cause system failure.
No error message appears, only internal errors.

Tsksup.c 297 Exception: task delay_medium vect 14

pc=0x0; sr=0