What would cause the dash cluster to keeping going out

Find a shop that specializes in automotive electrical systems and have them go through everything. If they know what they are doing, they will go through the wiring harness cleaning and tightening connections, cleaning grounds and looking for damage and deficiencies. They will follow up trouble codes and check components to make sure they are functioning properly and recommend repairs and part replacement as needed. It will cost a few dollars but if successful you’ll have a drivable vehicle and won’t spend hundreds randomly replacing parts and hoping for miracles. I know whereof I speak because I have a fleet of five 15 to 25 year old Gm vehicles including two Avalanches and a GM mechanic / electrical genius who does all those things to keep them running just fine. Every dollar I give him is money well spent.