I buy these certified renewed laptops frequently for work.I think I finally got my first lemon.  30 day warranty... hard drive didn't last 60 days, so I just purchased an upgrades 1TB SSD, fresh OS install and got back to business... a few months later it started randomly shutting down, have screen glitches.  All drivers and windows are up to date. Nothing in the event log calls to anything software/OS related.  Most likely a physical issues with the motherboard.  Anyway, my IT guy hasn't been able to pin point the issue, and he went through everything.  So I guess the point is (like anything you buy) there's no real long term guarantee.  Maybe the thing to do is be sure to get an extended coverage plan (assuming it's legit).  1 out of 6 isn't terrible and in the long run, I still saved money overall, compared to if I had purchased 6 new laptops.  All tech stuff is disposable, but it still sucks when you can't even get 1 year out of a device with an overhaul. Wish you all better luck than I had with this one.