closedChannelException

I am getting this

And I am getting on the position table -
error code 2013 lost connection to mysql server during query

Error from screenshot means that connection was closed between server and device which Traccar tried to send something back. MySQL error is self-explanatory.

And in position table positions are being inserted about half an hour late and before that the positions were being inserted in a right way but all of sudden it is done wrong. I can't determine why it is happening.