I have one of these laptops. I got it in April 2022. Within a month, it stopped charging on the back port. I did some searching and found numerous threads on the Lenovo Forum describing the same problem. The fix is to have the system board replaced. Fortunately, the front port would still charge, so I was able to use it while waiting for an appointment with onsite support. (They had to order in the system board, which took a while.)
Around a month later, the same thing happened again, but this time, the front port would only charge at 15W, meaning that the charger could not keep up, so during the time that I was waiting for another appointment for a system board replacement, I had to shut it off periodically to charge the battery enough so I could still work.
A couple of months later and the same thing happened again. This time, the front port is still working. Fortunately, I work for a large Corporation with thousands of Lenovo laptops, so Lenovo offered me a replacement. I didn't want another one of these POSes, so I ordered an X1G10. So far, it has been reliable. I haven't heard any reports of system board failures on the X1G10.
There are a lot of people that have experienced this problem and have reported it on the Lenovo Forum. Lenovo basically denies it's a problem, even though there are many reports of this problem. I used to think Lenovo was the best laptop brand to have. Previously, I've had quite a few Lenovo laptops and they were always rock solid. Since the last Lenovo laptop I had, I was using primarily HP and Dell. When I found out that the company was switching to Lenovo, I was looking forward to getting the X1. I've been very disappointed. The Lenovo of today is no longer the same company that it used to be. I would think twice before picking up one of these laptops.