Sensor Adhesive Failure

@dlwootten​ I own a 40+ piece SS3 system, installed since 2017 and a SS2 system before that installed in 2012. One thing I have learned is clean surfaces AND quality 3M strips (of different types) are the only way to go. When I say "different types", the 3M velcro and picture hanger types are what I am specifically talking about. If you do a search in the community, I posted pictures of the actual products used, which you can easily pick up at any Home Depot, Lowes or Ace Hardware store.  I specifically use the plastic, thicker velcro type for motion and glass break sensors in the corner of rooms. Why? They are thicker and compensate for all of my crooked, uneven corners and once installed, "they ain't going anywhere" as the saying goes.  I also use longer strips (medium) for all of the motions and glass breaks and can easily cut to fit.

Once installed, I put my hand on the sensor and move it lightly to the right and left. If it moves, it comes back down and I redo it. Once done I am confident they will stay put. I do the same for entry sensors on windows.

Finally, I clean my six smoke sensors faithfully once every 60 days.  (SS says 30 but experience tells me that is enough). At the same time, I also hand check, as described above, all of my sensors. Total time for the bimonthly maintenance? Under 30 minutes, including breaks, phone calls, etc.

Hope this helps

@captain11 thank you for the additional info, it is what I plan to do.  My issue is that a redo, a lesson learned, shouldn't have been necessary.  If enough folks inform them that customers must perform remedial measures to ensure the sensors to stay put...maybe they should account for that shortfall in the next upgrade, either by including satisfactory mounting strips or by adding info in the installation instructions - heck, I can write it now : "Simplisafe DIY setup cannot account for all homeowner mounting scenarios. Attempt to mount the entry sensor in the desired location.  If, after mounting according to instructions the sensor moves at all with gentle lateral pressure, do not expect the mount to hold.  In that case, please use instead 3m (whatever) mounting tape, covering the entire wall-contact surface of the sensor.  If that still does not work, please contact Simplisafe Support for additional assistance." I'm just a bit chapped I mounted all these, and now I have to redo them all because I don't trust they will hold.