Re: her fault for being impatient?
No, it's rubbish PSU design. All too common.
Live somewhere rural with a loose connection somewhere in the overhead transmission and after a while "natural selection" ensures you only have PSUs that cope. Also bean counters realise a UPS isn't a luxury on a server.
IMO the best aspect of a laptop is the built in UPS, when you live somewhere with dodgy electricity. You KNOW you need to save often, but sometimes get so engrossed you forget. Or forget how you did the clever function or paragraph of text written just after the last autosave.