There is that feeling, for me, currently about my laptop as well. I got it in 2015 and it pretty much died on me a year later, just after the expiry of the one-year warranty. I got it fixed in a major way instead of just getting a new one (changed the hard disk and also the monitor as it had some minor issues and it was included in the service package).

I love this computer more now than any of the other other machines I've had before because, since that major repair, it's been working perfectly, not a single inconvenience - and I use the hell out of it. It is basically always on and working, and is working well. At this point, I sometimes can't help but wonder how far? Even after the major repair, just some functions of it are getting a little old school... And right now, whenever I think about this, it provokes anxiety. Because this laptop is, by far, the best and most satisfying computer I've ever had. I don't want to lose it and take the uncertainty of a new machine... Even though I know well that my next computer has a much higher probability to be even even better than the risk of annoyance and stress. And when I just just finished writing that sentence, I realize that I do think and feel similarly about my human relationships. Including perhaps finding a therapist again. I could afford it. I am sure that I would use therapy very differently at this point of my life. The old experiences don't even give me anxiety now. More just "I obviously still have this interest"... and "why not"?