We've been through 2 of the newer Shark UV580 (Costco) in the last year. With the first one, it just stopped powering on after ~6mo of occasional use and the second one had intermittent shutoff issues with the power brush after a month. You could give it the Fonzie whack and it would rotate for a few seconds before stopping. They ran super hot and the DC motor noise was ear piercing, even more so as the filter needed cleaning.

Disassembled it expecting to find an obvious crimped wire or cracked solder joint...nope. Really liked the vacuum, it was great for a small area.