Poco - Phone problem

Sir on **/**/**** my uncle gifted me Poco x* and after *yr on **/**/**** its stopped working the front camera went off working it's keep crashing and after some days i am not able to get a call because my phone only displaying missed call if i receive call the i can't hear the voice of the called person. In *.* year is it fine that it should be happened many poco x* are having same problem. Sir and on the service center visit they told that the mother board is not working and it will cost me **k to be repaired.sir is it fine taht to keep spending on a phone after a * month warranty out .