EZ10 torque failure?

[DNGO]

I am working on an EZ10 adapter project. Customer requires that the EZ10 metal shell, which is adhered to the plastic base by a loctite E-60HP glue and cured, passed torque test at 1.2nM. We tested the adapters with a torque wrench at 1.4nM (we increased the requirement as a safety net) as a part of the QC process and they passed. However, when the parts got to Japan, the customer tested them and there was a lot of failure. What could have caused the failure?

 

[metengr]

If you cross post, at least reference the other forum

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