I suspect that this was probably self caused. My Kindle Oasis from 2019 has developed a swollen battery, causing the bezel to separate from the metal case, worst in the corner with the charging port. I normally read in one spot in the house and have made a habit of leaving the charging cable permanently attached. Apparently not a good idea as this is my first Kindle reader that developed this problem. I did have a similar problem develop with a Kindle Fire keyboard that was also left charging permanently so continuous charging appears to be a NO NO with lithium polymer batteries.
