Asterisk 13.21.1 on Ubuntu 16.04 is shutting down alone (PJSIP)

I have a trouble with Asterisk 13.21.1 on Ubuntu 16.04 that is shutting down alone once or twice a month, looks like DTMF messages are causing it because it happened sometimes and always that it happens in the Console log I found it:

[Nov 25 15:25:48] WARNING[25223] res_pjsip_pubsub.c: No registered publish handler for event presence
[Nov 25 15:25:54] NOTICE[13176] res_pjsip/pjsip_distributor.c: Request 'INVITE' from '<sip:9930115423316233:5060@xx.xx.xx.xx>' failed for '163.172.207.104:59500' (callid: 1553971558-1935798106-258901474) - No matching endpoint found
[Nov 25 15:26:28] WARNING[10061] res_pjsip_pubsub.c: No registered publish handler for event presence
[Nov 25 15:26:54] WARNING[30328] res_pjsip_pubsub.c: No registered publish handler for event presence
[Nov 25 15:26:55] DTMF[1910][C-0000099e] channel.c: DTMF begin '*' received on PJSIP/GTIN-GTGI-00001d52
[Nov 25 15:26:55] DTMF[1910][C-0000099e] channel.c: DTMF begin passthrough '*' on PJSIP/GTIN-GTGI-00001d52
[Nov 25 15:26:55] DTMF[1910][C-0000099e] channel.c: DTMF end '*' received on PJSIP/GTIN-GTGI-00001d52, duration 273 ms
[Nov 25 15:26:55] DTMF[1910][C-0000099e] channel.c: DTMF end accepted with begin '*' on PJSIP/GTIN-GTGI-00001d52
[Nov 25 15:26:55] DTMF[1910][C-0000099e] channel.c: DTMF end passthrough '*' on PJSIP/GTIN-GTGI-00001d52
[Nov 25 15:27:08] WARNING[22035] res_pjsip_pubsub.c: No registered publish handler for event presence
[Nov 25 15:27:26] WARNING[2126][C-000009a0] chan_iax2.c: Resyncing the jb. last_delay 0, this delay -264948469, threshold 1000, new offset 264948469
[Nov 25 15:28:02] DTMF[2126][C-000009a0] channel.c: DTMF begin '2' received on PJSIP/GTIN-GTGI-00001d5b
[Nov 25 15:28:02] DTMF[2126][C-000009a0] channel.c: DTMF begin ignored '2' on PJSIP/GTIN-GTGI-00001d5b
[Nov 25 15:28:02] DTMF[2126][C-000009a0] channel.c: DTMF end '2' received on PJSIP/GTIN-GTGI-00001d5b, duration 92 ms
[Nov 25 15:28:02] DTMF[2126][C-000009a0] channel.c: DTMF end passthrough '2' on PJSIP/GTIN-GTGI-00001d5b
[Nov 25 15:28:03] WARNING[20393] res_pjsip_pubsub.c: No registered publish handler for event presence
[Nov 25 15:28:03] WARNING[17304] res_pjsip_pubsub.c: No registered publish handler for event presence
[Nov 25 15:28:05] NOTICE[30328] res_pjsip/pjsip_distributor.c: Request 'INVITE' from '"2000000" <sip:2000000@xx.xx.xx.xx>' failed for '77.247.110.9:5071' (callid: 3bba480dfb6806e5f9b72ea7c1db1050) - No matching endpoint found

See https://wiki.asterisk.org/wiki/display/AST/Getting+a+Backtrace for how to progress this.