Apple Watch Series 4 Display

My Apple Watch Series 4 Display separated from its case just after the watch came out of warranty. Is poor adhesion a common problem with the Apple Watch? Has the adhesive been improved in later models? I have been a devoted Apple customer for almost 35 years and this is the first time I have experienced a manufacturing/design defect. I believe an electronics adhesive should last at least 3 or 4 years!