2011 RSS random multiple fault codes and lights

[Bad-Day]

I own a 2011 RSS with 23k miles. Randomly the check engine light and multiple other lights will come on, along with displaying VSS, ABS, DPS Faults. The gauges will also go crazy or not work. I can shut it off or turn the switch on and off and they will go away. I had it to a dealer and he said it was a loose connection with the connector plugging into the instrument cluster. So I sometimes remove the panel and re-seat the plug and that will clear it up for a while as well. Can someone give me a permanent repair/fix? I have seen others mentioning a similar problem and they say it is a relay.

Thanks in advance