I'm sure I'm not alone in experiencing people wishing to have mezuzot checked or replaced due to recent tragedies, misfortunes or just a feeling of bad luck. Indeed maintaining kosher mezuzot as segula or as a response to misfortune has basis in our tradition.
I get more concerned when the impression I get from some people is that the mezuza is the cause of the misfortune and that, when replaced, they seem relieved that now their lives will magically turn around. Like a charm. Someone once even asked me to make sure their mezuzot are extra lucky and to give it an extra blessing.
It's more of an uncomfortable feeling for me and I never know quite how to deal with it or what to say when customers ask me about replacing mezuzot in the event of a loss etc.
Any advice from what works for you?