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it sounds like your connector is a bit loose for the ribbon cable. the only thing I can think of to suggest aside from ordering a new decoder would be to try taking a small strip of thin plastic , cutting it to the width of the ribbon cable , and inserting it into the connector with the cable ( on the side without the actual electrical connectors of course ). Hopefully that would add some bulk to the cable , and allows the connector on the decoder to grab onto it more firmly.
Aside from that I'm not sure what else you could try, unfortunately troubleshooting is a tad difficult like this.
Hope you get it worked out!