All devices have a “Critical Need” circuit built-in, whereby the device will fail when neededEnjoyed reading your statement here Esma Rose. I endorse your words about our existence & do not understand why so many people are like this. Condolences for the loss of your hubby. Like yourself, me & many other folk here l am sure, find their daily dose of the SDC is something we cannot do without. Hope your PC doesn't fail again at the wrong time for you & my hopes are the same for Donna above. Scammers are so clever these days.