Wwan disconnect every 6 hours

Hi,
I'm using openwrt 18.06.4 on a D-Link DWR-921 4G LTE Router

"DISTRIB_ID='OpenWrt'
DISTRIB_RELEASE='18.06.4'
DISTRIB_REVISION='r7808-ef686b7292'
DISTRIB_TARGET='ramips/mt7620'
DISTRIB_ARCH='mipsel_24kc'
DISTRIB_DESCRIPTION='OpenWrt 18.06.4 r7808-ef686b7292'
DISTRIB_TAINTS=''

Everything is working nice, but I have a wwan disconnexion every 6 hours.

In log I've only :
"Wed Jun 24 10:40:50 2020 daemon.warn dnsmasq[1519]: no servers found in /tmp/resolv.conf.auto, will retry
Wed Jun 24 10:40:51 2020 daemon.notice netifd: wwan_4 (29252): udhcpc: received SIGTERM
Wed Jun 24 10:40:51 2020 daemon.notice netifd: Interface 'wwan_4' is now down
Wed Jun 24 10:40:51 2020 daemon.notice netifd: Network alias '' link is down
Wed Jun 24 10:40:51 2020 daemon.notice netifd: Interface 'wwan_4' has link connectivity loss
Wed Jun 24 10:40:51 2020 daemon.notice netifd: Interface 'wwan_4' is disabled"

Any idea of why udhcpc receive a SIGTERM and from which process ?

Thanks for your help.
Regards,
Renaud.

Looks like the interface is going down, and that triggers the SIGTERM. I would have a look to the previous messages, or the messages on the main router.

Most likely that is initiated by the carrier, either as a result of inactivity or just because they want so.
With standard OpenWrt you will need to take care about re-connect.

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