Yamaha DGX-520 suddenly became quiet, with very little volume - no adjustment

I moved my Yamaha Portable Grand DGX-520 keyboard, carefully, gently, about 10’ across the room to another wall. The volume became quite low the next time I played and the Master Volume adjustment now has to be on max to be able to hear it. Any ideas as to what has happened? A smooth process moving it around the corner to the other wall, so no damage to blame it on. ??

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