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First evaluate if it is Octoprint or just your printe, you do this by disconnecting Octoprint and go purely by SD-card. If it still does it when disconnected from octoprint it's your ender 3, I have a similar error, which usually goes away after a restart. so do that first thing after disconnecting.
Then when still disconnected from Octoprint test if it is the model you are printing or the slicer, switch up slicers to see if it is in the G-code, with your regular slicer see if it is the model.
Did you do any hardware changes? Motherboard, bl-touch, etc....
Did you do any firmware changes?