Nintendo received a new update recently, moving into version 5.0. With this update has come a very unfortunate side effect. People have found their Nintendo Switch have become unusable after plugging into a third-party dock.
Nyko have been fielding support from angry and frustrated users of their dock on their Twitter page since the issue. They have been offering to pay for repair costs, and even replace some Switches that were out of warranty.
One of the earliest reported cases of this was from the YouTube channel Spawn Wave. They did a deep dive into what the issue is, and also saying how it is highly likely that your save data will be gone if you suffer from this issue. The video can be found below.