So, if your IFR approved GPS does something to you that you didn't think it should, like not tell you it's lost when it's lost, what do you do?
Don't you think you should tell someone like the manufacturer, the civil authority, possibly the air traffic control people so that these things can get monitored, and possibly someone might fix something if enough of it goes bad?
Service Difficulty Reports - send 'em in. Enough people send these things in, it will get noticed.