Yes. It's not uncommon that over time, adhesives are affected by heat, humidity and exposure to the sun and UV rays; the Thinline Trailer Reflectors - Adhesive Backing - Screw Mount - Rectangle - Amber - Qty 2 # RE15AK aren't immune to this, unfortunately. However, when installing these I typically don't recommend relying only on the adhesive backing and that you also use a self tapping screw like the Screw - Self-Tapping Phillips Head - 8 x 3/4" # 1131832 to keep them firmly attached to... view full answer...