I haven't seen the evidence that it "keeps occurring"As I said I was wondering why the above keep occurring.
Your conclusion?
Users seldom understand the limitations of using radio communications on a general licence frequency. They see wireless as the way forward because it is sold that way when in fact wireless between items of fixed equipment is often a sales gimmick. For alarm systems it uses simple installation as a way to sell systems to people who [1] believe the salesman without question and [2] would not install an alarm if it meant having to put wires around the house.As mentioned , a couple of users not quite understanding a process does not make the product bad.
If the siren is on the table next to the panel then it is almost impossible for the radio linkage between them to not work. The problem comes when the "learnt in" siren is moved from the table and placed on the outside wall where it may be at or beyond the range of reliable communication from the panel.I certainly have NEVER been in a position where I was unable to learn in a siren.
What test do you perform ? It should include a field strength measurement of the signal at the receiver to ensure it is well above the minimum level required by the receiver for reliable operation. Then apply the reduction factors for things that will reduce the field strength, for example a wall soaked by rain will reduce the signal passing through it more than a dry wall will.Which is why I always test the system after installation.
How many un-reported siren failures have occured ?When I get my first reported siren failure I will report back with my findings.
Can you provide the URL for your website ?Its all there on my website and with the advice given upon installation.
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