Bowing frame?

I went in the garage today and noticed my x-carve was bowing.the middle was lower than the sides. Looked for a while, there’s nothing under the frame and all the bolts are still tight. It’s off by a good 3/16". Has anyone come across this? I know the weather here has been wonky for the last few weeks, but yesterday morning it was level.

Pics would help.

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