LC1120 (Iso,ALS,Oven,VWD) restart with no reason.

LC1120 suddenly restart. I have checked power line stability and show no problem (120 V aprox). Sometimes LC can work for about 2 hours and suddenly restart. Some other times after in few minutes, even 30-45 seconds LC restarts. I was looking for information about voltages coming from power supply but i can found it. Besides diagnosting PS, can somebody give me suggestions to fix this problem?

Note: EzChrom elite dont show traces about those disconnections. Lab Advisor dont show info about disconnections. So, I can not see what o where the problem is

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