I have had several instances where customers have reported problems with the PLC not operating properly. Everything is fine for several months and then the problem occurs. Reloading the program corrects the problem. I am using a MeanWell 24V switching power supply. In your installation instructions, you recommend using a capacitor/diode between the power supply and the PLC. Could this correct the problem? How about a surge suppressor? Any advise would be appreciated.