Have you considered insisting on it being replaced?

Apple has an unwritten policy of replacing a machine on it's fourth trip in for service. I had a bum MacBook a few years ago. Sent it back three times for various issues. The fourth time it went down, I called AppleCare, explained the issue and asked the CS rep to please look up my warranty history. She did, and two days later I had a new - upgraded as the other model was no longer available- laptop.
I don't know what HP, Dell etc. do in cases like these, but it might be worth a shot.

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