You should post a picture of the results of your atomic pull (the filament strands). That can usually give us enough info to determine if it's a PTFE problem.
If it is the case that you do need to take it apart, I suggest getting a TFM coupler (the new UM2+ couplers) as they last a heck of a lot longer than the PTFE ones the UM2 came with. Also consider upgrading to n olsson block so you can change nozzles easy.
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Labern 775
The PTFEs can sometimes get destroyed pretty quick with ABS.
If atomic pulls are coming out clean and every thing else seems good then it's probably time to check the coupler.
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