I think that every time those alarms go off and they are false, the store should have to pay for it. The alarm going off is accusing a person of a crime in my opinion. A person should be compensated for a false accusation. They at least owe you an apology. I raise hell with them when they go...
I have owned several other brands of saws in my life. Stihl is the finest in my opinion, my first was a used saw (015) which I still have and it cuts as good as a new one. It is so old they have discontinued a lot of the parts for it.