I had the same problem once and for me the problem was in the settings. I could not see it anywhere, but after resetting my settings using the cura presets. It went back to normal. You should try that. It is also possible that some of the points are not touching the base (floating). but I do not know what you wanted to print.
If the problem is not in that I would go with JohnFox his answer which is the blockage.
Edited by Guest
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JohnFox 25
Not sure but it looks like the feeder slowed down or you had a blockage - which eventually cleared.
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