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Have you checked the power cord,,these things are known for having problems with loosing contact inside power cord plug,,,or cable,, if you have a ohm meter,,,, ohm out each wire from end to end and it should be under 5 ohms on each wire.
If you don't know how and have a volt/ohm meter let me know and I can explain.
You can also put a new end on power cord,,or replace cord as that is usually were the issues are,,they are available at any local hardware store for a couple dollars.