We have a inspected roughly 200 devices and about 10% of devices appear to have a gap or void in the material that is used to attach the lid to the rest of the package. It appears to not be consistent with the claimed hermetic seal. We have also been running into the "stuck" issue where the z axis output is stuck at 2.05 when the board is tapped and can be unstuck by tapping again. There are a few other threads that cover this sticking issue. I searched but did not see a post about this lid issue, or the possibility of counterfeit ADXL355's. The attached pdf shows what we are seeing. We sourced these chips from Mouser March of 2022.
I originally posted this on 12/19 and did not receive any response. EZ suggested moving it to temperature sensors forum which I did on 12/28 but still no response. We need to figure this out soon before our next build.
Thank you.PDF