I agree with @geert_2 that more details would be helpful. Among other things, did the problem start to happen with the same models you were printing successfully, or did it happen when you switched to a new model? If so, could you supply an image of the model?
I think you will need to provide more specific info: which printer and model, which exact material, which settings (e.g. nozzle and bed temp, and all the rest, project file), bonding methods you tried, and especially close-up photos and maybe videos.
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