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It sounds like the connector to the display panel may be a bit lose or need reseating...
Good to know, this sounds like another strong possibility.

Does the display pop out the front, or do I go in through the back panel? I'm very confident around electronics repair, but I've never disassembled these 5200s yet.

Main System: MiniDSP SHD (Roon, Dirac, Volume) > G61R > DSP5200 Speakerlink L/R, 2x SVS SB3000 Subwoofers
Office1 System: Genelec 8030c L/R, Genelec 7060B Subwoofer
Bedroom System: DIY Sure 2x100w Class D Amp, ELAC DBR62 L/R