Traccar stopping after a week

Traccar server is crashing after one week online.
Any ideas?

root@traccar:~# service traccar status
 traccar.service - LSB: yajsw wrapper for Traccar
   Loaded: loaded (/etc/init.d/traccar; bad; vendor preset: enabled)
   Active: inactive (dead) since Tue 2017-11-21 14:26:28 UTC; 7h ago
     Docs: man:systemd-sysv-generator(8)
  Process: 31878 ExecStop=/etc/init.d/traccar stop (code=exited, status=0/SUCCESS)
 Main PID: 1889 (code=exited, status=0/SUCCESS)

Nov 21 14:26:28 traccar traccar[31878]: ************* STOPPING traccar ***********************
Nov 21 14:26:28 traccar traccar[31878]: Nov 21, 2017 2:26:28 PM org.rzo.yajsw.os.posix.PosixService getPid
Nov 21 14:26:28 traccar traccar[31878]: INFO: wrapper pid file: /run/wrapper.traccar.pid
Nov 21 14:26:28 traccar traccar[31878]: Nov 21, 2017 2:26:28 PM org.rzo.yajsw.os.posix.PosixService stopProcess
Nov 21 14:26:28 traccar traccar[31878]: INFO: stop daemon with pid 1889
Nov 21 14:26:28 traccar traccar[31878]: Nov 21, 2017 2:26:28 PM org.rzo.yajsw.os.posix.PosixService stopProcess
Nov 21 14:26:28 traccar traccar[31878]: INFO: process not running
Nov 21 14:26:28 traccar traccar[31878]: Nov 21, 2017 2:26:28 PM org.rzo.yajsw.os.posix.PosixService getPid
Nov 21 14:26:28 traccar traccar[31878]: INFO: wrapper pid file: /run/wrapper.traccar.pid
Nov 21 14:26:28 traccar traccar[31878]: Service traccar stopped

Have you checked logs before asking for help?

Yes.
Nothing useful.

2017-11-21 14:23:39  INFO: [FD8FC673] connected
2017-11-21 14:23:41 DEBUG: [FD8FC673: 5027 < 46.230.129.86] HEX: **
2017-11-21 14:23:41 DEBUG: [FD8FC673: 5027 > 46.230.129.86] HEX: 01
2017-11-21 14:23:44 DEBUG: [FD8FC673: 5027 < 46.230.129.86] HEX: *                                                                                                                                                                                                                                         e01f100005e8a00010000cb1f
2017-11-21 14:23:44 DEBUG: [FD8FC673: 5027 > 46.230.129.86] HEX: 00000001
2017-11-21 14:23:44  INFO: [FD8FC673] id: 3*, time: 2017-11-21 14:14:25, lat: **, lon: **, speed: 0.0, course: 0.0
2017-11-21 14:23:48  INFO: [FD8FC673] disconnected
2017-11-21 14:25:00  INFO: [74124B23] disconnected

That's because you are looking at the wrong log file.

Maybe if you can help me with the correct file, I'll figure out the problem?

Well, there are only 2 logs files.

cat /opt/traccar/logs/wrapper.log.20171121
INFO|wrapper|Service traccar|17-11-21 14:26:15|waitpid 1904 9
INFO|wrapper|Service traccar|17-11-21 14:26:16|exit code posix process: 9 application: 0

https://www.traccar.org/forums/topic/exit-code-posix-process/