reason to p1_mysql_conn: Connection closed, exiting

2015-10-26 11:54:00.841 [debug] <0.30172.0>@ejabberd_receiver:process_data:349 Received XML on stream = <<"\r\n">>
2015-10-26 11:54:00.841 [debug] <0.30172.0>@shaper:update:120 State: {maxrate,1000,0.08383024900032382,1445860428962522}, Size=2
M=1.0000419168814514, I=11878.945
2015-10-26 11:54:17.135 [debug] <0.30415.0>@ejabberd_odbc:log:647 p1_mysql_recv: Socket #Port<0.49751> closed
2015-10-26 11:54:17.136 [error] <0.30414.0>@ejabberd_odbc:log:649 p1_mysql_conn: Connection closed, exiting.
2015-10-26 11:54:17.136 [info] <0.30414.0>@ejabberd_odbc:log:648 Closing connection #Port<0.49751>: ok
2015-10-26 11:54:17.136 [debug] <0.30417.0>@ejabberd_odbc:log:647 p1_mysql_recv: Socket #Port<0.49752> closed
2015-10-26 11:54:17.136 [error] <0.30416.0>@ejabberd_odbc:log:649 p1_mysql_conn: Connection closed, exiting.
2015-10-26 11:54:17.137 [info] <0.30416.0>@ejabberd_odbc:log:648 Closing connection #Port<0.49752>: ok
2015-10-26 11:54:17.137 [debug] <0.30419.0>@ejabberd_odbc:log:647 p1_mysql_conn: greeting version "5.6.26-log" (protocol 10) salt "/U@}uW1/" caps 63487 serverchar <<8,2,0,127,128,21,0,0,0,0,0,0,0,0,0,0>> salt2 "6`aG\"n(v?sHO"
2015-10-26 11:54:17.137 [debug] <0.30419.0>@ejabberd_odbc:log:647 p1_mysql_auth send packet 1: <<7,162,0,0,64,66,15,0,8,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,98,114,105,100,103,101,50,99,97,108,108,0,20,204,251,179,68,160,200,178,181,27,72,13,26,23,209,141,138,16,82,147,38>>
2015-10-26 11:54:17.137 [debug] <0.30421.0>@ejabberd_odbc:log:647 p1_mysql_conn: greeting version "5.6.26-log" (protocol 10) salt "XwnA84=v" caps 63487 serverchar <<8,2,0,127,128,21,0,0,0,0,0,0,0,0,0,0>> salt2 "Y>fj`\"(?H)3e"