Check the multiplug connectors to the CEM behind the glovebox, and also in the driver's footwell behind the carpet. I'm not saying this is definitely the cause of your problem, but poor contact due to dirty or corroded contact pins is a known issue that can lead to multiple failures and the dashboard lighting up like a Christmas tree.
It may be that just breaking and making the connections will help, although you could try sparing use of contact cleaner on the pins. I believe that Volvo can supply a replacement pin kit with gold plated connectors, but it's quite a bit of work to swap them all.
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