Failed to upgrade

I'm having the exact same issue with my mom's phone. It did the same thing back 2022. We had to turn the phone in because it will begin turning off and on randomly. This is her 2nd TCL and same deal. I'm turning her phone in and getting her the Motorola Stylus. Because this is just stupid. Even TCL doesn't know how to fix it. I was on the phone with them for over an hour with some guy in the Middle East. Because T-Mobile Tech Support was far from helpful about turning it in again with the warranty. I'll never get another Chinese made cell phone ever again. Poor quality and horrendous experience.