problem with perp in a loop

[Bass Assasin]

Has anyone ever had this happen. I did a couple perpendicularity checks . So in a loop of 32 it screws up every third one and is off by .060" when it should be around .001". I re-ran it and sure enough, measures two correctly and then the third bad. The first time I ran it the third one was bad and every third after that, the second time the first bad then every third after that. I won't be doing this again so no big deal for now but curious if anyone else has seen this.
4.1 global

[Underspec]

Are these threaded holes you are measuring?

[Bass Assasin]

Nope. There actually bosses that an insert goes into on a plastic part. It maybe just a matter of redoing the dimension and then it will be fine. I'll check this when I get the fixture back and just run one part and see what happens. I have not had an issue with a loop for so long it made me wonder.

[Underspec]

I don't like looping anymore. Patterning is my thing now.