How to solve RAM losing problem of a motherboard?

Hello friends,
I have been using a motherboard for the last 4 years. I have got a really good service from this motherboard till last week. Last week, I got a problem in it. My motherboard has 2 ram slots and I use 2 rams on both slots.
But, Last week I saw my PC was not turning on. Then I opened the CPU box and opened both of the rams. When I reconnected them into the ram slots, it was not working for a long time. Then I noticed a losing problem on the ram slots. It was becoming lost again and again.
This is a very irritating situation for a pc user. I do not know that, How to get rid of this problem. Is there any other way repair my ram slots? Or is there any sort of new PCI cards that has a ram slot? (I don’t know about the existence of this sort of cards).
Every body knows that a pc can’t run without a ram. But my ram slots are suffering from the Losing problem. What should be the procedure to get rid of this situation?
Thank you friends for reading this attentively.
