I worked at a lab too, and can tell. You that it's a lab problem.
I was going to say Error, but to me an error is something that happens to 1 roll, and the technician corrects the problem with the rest.
The one I worked at changed their chemistry twice in 2 years. They only changed it the second time because some critical parts were plugged solid.
To say the least, there was a huge quality difference from before to after, and I only processed my own film after.
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