fine for about 2 weeks: it no longer holds

I got two weeks ago as ordered the two Trotec Airlock and mounted directly. The Assembly worked both times properly. The only problem is that the adhesive of the Trotec Airlock already after the first day of the triggers Fensterrahemn. Thus, the adhesive of the Trotec Airlock needs to be attached to every day's New at the window so that it holds. Now after about 2 weeks, it is no longer possible, the Trotec Airlock to fix the window so that it holds.

In another apartment I have the Einhell HotAirStop attached (also purchased from Amazon), which fulfills the same function as the Trotec Airlock. The only difference is that the Einhell HotAirStop holds since lngerer time and need not be permanently attached to the frame again. Recommendation: Buy Einhell HotAirStop! (I have the Trotec Airliock ordered, because due to the current heat (and the resulting high demand) the Einhell HotAirStop on Amazon was not available or has cost 50 instead of 25 euros per piece. In hindsight, I should have the 50 euros per piece output ...)