The Taz 4 suffers from heat creep, the longer the print, heat slowly travels from the hotted up the tube and the cooling fins don’t help, eventually the filament expands where it’s not supposed to, causing a jam. It was solved from the Taz 5 onward with a change to the hotted and a little fan. I’ve had my taz for 9 years, it was a taz 4, I upgraded to the taz 5 when the kit came out, that solved the problem. I’m not sure you could get upgrade now, it would be open source so you might be able to get the list of parts to recreate it, it requires a new wire loom to the hot end though, and a firmware update.
Try this post for a fan duct modification to keep the tube above the hot end cool, might be easier, hope it helps.
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