What caused the drop out of kav Soft Close Ball Bearing slides?

What caused the drop out of kav Soft Close Ball Bearing slides?

I’ve received the QQ message last week, from a customer worked with many years, he complaints if we’ve changed the quality, cause the workman reflects they are too easy to get broken. ‘’The quality is remain the same, no change at all, how many sets have this problem? “A lot……They told me before and the manager asked if we’ve changed the supplier. He sent me a photos and invite me…