In the 29+ years I've been in this industry there has yet to be one successful lawsuit against an installing dealer published in any of the trade journals based on a "bug" in an alarm panel. The most common causes cited in product liability lawsuits against alarm dealers have consistently been failure to respond and improper or inadequate installation.
The next most common source of lawsuits (and this is growing) isn't actually a product liability issue at all. It's misleading advertising / unfair trade. Most of these lawsuits are brought by attorneys general of various states against dealers who offer "free" systems which require paid monitoring services.
The fact is, despite repeated claims to the contrary, successful product liability lawsuits in the alarm industry are relatively rare compared to other industries such as automotive. Part of the reason successful lawsuits are so rare is that alarm companies almost invariably have very carefully worded disclaimers of warranty, limitations of liability and third party indemnification clauses in their contracts.