Samsung s21 issues

[Amir1980]

Samsung s21 worked only two years and then suddenly died. I took it to repair shop and the guy told me that the motherboard is dead. Of course i take my phone home with me and tried to reset to factory default and the phone started to work. It worked for 20 minutes and then it shows me two errors - Process system not responding and UI not responding. After that it goes off and turns of again. Last time it turned off and now it wont go on at all, not even charging. If the s21 is a so called "flagship", why it died after 2 years and three months only?! I used that phone only for calls, fb messenger, viber and whatsapp!

[Amir1980]

Is it now dead for good or should i try with another repair shop?!

[LukeB2]

@Amir1980 What troubleshooting have you done? Was this sent to a third-party engineer or through Samsung?

[Amir1980]

Idk, I was not present when he opened the phone. So I don't know what he was trying to do. He just told me that the motherboard is broken. But the phone worked after that and i did the factory reset and it was fine for 20 minutes, then, i get errors on the phone like UI not responding and process system not responding.

[LukeB2]

Did you do any troubleshooting? Was this a third-party engineer? Does this error message come up when using a specific app?