Come to think of it, when the weather changed from the cold outside to the warm inside, the board would be out of tune terribly until the unit actually warmed up. I had this problem last winter, but never in the summer.
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Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)