I purchased my second Chison Q5 before the end of 2021, and I was very happy with it. In fact, I had considered getting a 3rd one for my ObGyn practice. However, it stopped staying on in 10/2022. It will power up and then completely shuts off after 5 minutes or less, even plugged in. We tried reaching out to Chison in the US mainland with no success. Gabrielle from Customer Service at KeeboMed (who I purchased this 2nd US from) reached out to me on 11/29/2022 to complete this review. I was off-island on vacation but responded to her about this problem on 11/30/2022. My office manager Emailed her on 12/14/2022, but we have not had any further response to help fix this US. I hope that someone can help us so I can amend this review.