Is the lace coming free from the bonding material or is the tape/glue coming away from the skin? If it`s lace coming free, that could be mean there is some factory-residue on the lace -most likely silicone- which was not properly washed off before the bonding and it`s preventing the adhesive material `gripping`, or , if it`s coming off the scalp skin, you may need different/stronger ones...the fact that you said it`s coming loose at both front AND back would make me think it`s residue on the lace because I think she used glue at the front and tape at the back? It`s unlikely that if it was a `skin/scalp`issue that 2 different materials would both `disagree`with your skin at the same time... for example, you might get a `weak`tape, but a strong/good hold with the glued part.....again, it`s trial and error at the start...the fact that it`s loose in 2 different areas would make me think it`s a case of the lace coming loose from the adhesives ?