Hello Carabajo,

please mind "Uncle Donalds" post "invisibility and durability of different contour tapes?" from Sun May 17, 2009 8:18 pm as he describes
a similar problem.

Just an idea where this problem might come from (and why it does not appear on the sides): if you clean your "broad" brow / forehead while showering
and leave the foam on your forehead than there`s mich more soap that slowly "crawls" under the adhesive ( as compared to the smaller "coast" the sides
offer to the "crawling" foam ). And the cleaning agents for sure neutralize the adhesive.

Do you know what I mean ??? I guess not ( dont`t even know if I`m right, just crossed my mind).
Newbie with less written English skills tries to post a fancy comment...

Best regards Carsten