I also have a handful of people who I only ever seem to see when their computer goes belly-up.
This is why I do not repair computers if I can help it. It's a competitive field and not a very profitable one.
And after you've fixed it, and it goes wrong through user-stupidity/ignorance or hardware failure, they will blame you as you were the last one to work on it.
So, me no do that thing at all unless I'm forcibly coerced.