Error Display on PLC UNIMATICONTROL - E

Hi,

I Have problem error when start with Display Unimaticontrol - e , for machine test Hose Pressure UNIFLEX P200.

The Display will write self with "VVVVVVVVVVVVVVVVVVVVV" , like example in photo attaced.

I ever Remove all connector to PLC ( During Power Off ) mean need to reset for error and Clean all Connector with CRC, after re connect Display ok ( Good Function ) but that only hold 2 Days.

After 2 days Problem return appear.

:wishlease advice to handle this problem from your all

Thanks,
Rgds,
Marzukiddin