I know this is a pretty old discussion, but I had the same trouble recently. In my case, it think it could be a pattern caused by the extruder gears biting into the filament. I found that the problem seemed to be worse with increased retractions. That makes some sense to me, the more retractions you let the slicer make, the more the extruder gears are ...
I had this exact issue - PLA wasn't sticking to itself. It was intermittently being dragged around by the nozzle, and prints literally fell apart when removing them.
The problem: bad filament. I bought a new roll and the printer worked fine afterward.
I'd suggest running through basic maintenance. Check
Is the nozzle clean/unblocked? If not clean it out
Is the nozzle worn? If so, replace it
Is the bowden tube okay in the hot end ? If not, replace, or at least shorten it.
Are your e-steps calibrated correctly?
Also consider whatever mods were made, and whether they help or not. There's a ...
I noticed that these problems happen when there are retractions on layers. I don't have problems with round and simple objects without changes on layers or where all layers are identical.
Based on the above, this is not a heat related problem. It's likely inconsistent amounts of material lost from the nozzle just prior to the affected walls. This could be ...
That kind of issues can be related to multiple causes:
Heated bed operated in "bang bang" mode (heater on until set temp reached, turned off until set temp minus threshold is reached, and so on), which causes periodic expansion and contraction. It is solved by using PID algorithm for bed heating
The slicer is set with a minimum layer time and the ...