In case anyone else reads this and the above comments don’t help, I was having this problem and like the folks said, this sounds like heat creep. My heat creep was coming because the nozzle throat/neck (long skinny part from the top) was not transferring heat into the heatsink. I added thermal paste to the outisde of the neck and inserted it back into the heatsink and it fixed all of my mid-print problems. But I do think that filament resistance plays a role too.
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