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Hopefully you are able to get it fixed quickly! Sounds like perhaps a bad ground (or grounds). They may need to go over and tighten them down and/or add washers, or, from looking at some of the linked posts, possibly investigate the battery cable harnesses (+ and -) and potentially replace them. Also, they should verify the cluster has the latest version, seems a version update fixes some issues with cluster problems and if the car maybe was built a while ago, sat for a number of months waiting on chip(s), perhaps it has an older software version.
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