What can cause this?

I’ve tried a new lamp, new cleanser, new primer… I’ve never had this issue before , it started a month ago and most of my clients are having chipping at the free edge within a week! I have also tried capping the edges more, or doing the finish file after. Any suggestions would be much appreciated 🙏

I’ve tried a new lamp, new cleanser, new primer… I’ve never had this issue before , it started a month ago and most of my clients are having chipping at the free edge within a week! I have also tried capping the edges more, or doing the finish file after. Any suggestions would be much appreciated 🙏