I have suffered with similar problem, once knocking patch off early on where Abbott kindly replaced free of charge and another 4 days from end where it was hanging on for dear life before eventually falling off. Considering cost of CGMs I bought a packet of those "Not Just a Patch" transparent patches from Amazon. Cost just short of £20 for 20 and apparently stay stuck for 10-14 days. I put the patch on about 4 days in and so far the last 2 have lasted until the CGM stops. They do stay stuck pretty good and although add on another quid to the CGM price I consider worth it as long as it keeps the patch in place which it seems to do.