I'm having some problems with some of my clients' nails lately and i have no idea what's going on, so i thought maybe someone might be able to give me a clue. I work with pronails gels and usually my clients have minimal lifting considering they like to go 4-6 weeks between fills. But all of a sudden some of them are getting a lot of lifting, while others are having no problems. The worst is this one lady that never gets any lifting but the last two times i did her fills, the nails lift severely after 3 days or so. The only thing I've changed recently is from using acid primer to acid free primer, but the problems started before this change. I'm really confused because i just can't figure out what's happening. Can anyone give me a hint? I've been thinking it might be a problem with my lamp but the bulbs are only about 3 months old, my last ones lasted almost 12 months!