I have had no problems with my BambuLabs A1 (with AMS lite) for the most part and generally love it. But for some reason this last, simple 1 color, one object print started doing something weird. Every 20-30 cm of line printed it goes and purges. (See picture, where it had only printed a short line and then went to purge. See all those white poops? That's from a previous attempt where it stopped repeatedly to purge, similarly.) It does this repeatedly. Although I'm not an expert in 3D Printing I can't think of a reason a printer would be doing this? (The print seems to come out fine if I let it do it's thing, it just wastes a LOT of material and takes much longer than it should.)

It's PLA, BTW.