I think my worst experience so far would be with a Redmi 9T. The first few years it performed excellently, its snapdragon 662 was very good for everything back then and its 6000 mah battery was a wonder.
But over time a bug came up when installing updates that didn’t allow the updates to be downloaded, and when I managed to install them, it didn’t recognize them as an official ROM. Soon the time came to update it to miui 13.0, but due to the same update problem I ended up stuck in miui 12.5
Following this, the fingerprint sensor burned for no apparent reason, and it heated up to the point of making it necessary to change the part or simply remove it (I decided to remove it).
After that, a problem already known for the Poco X3 Pro came up. Sudden death, I restarted the phone and it would not turn on again due to a board problem. I took it to get it fixed And they made a power bridge so that it would turn on. But if it went out it would die again.
Finally all the buttons died. Both the volume and power buttons sank into the same housing, the Flex burned and became useless. Likewise it was impossible to turn it on. And if that wasn’t enough, the charging hub also died, it stopped charging, so the phone turned off and went into sudden death again.
All this in less than a year and a half. Its excellent battery and its good performance (So for the mid-range) All this in less than a year and a half. Its excellent battery and good performance (for the mid-range) came with many problems.
