Ddns script terminates unexpected. need help

Hi,
I have a problem understanding ddns-scripts application for openwrt. I need to have it running all time. For weeks. But on multiple machines it stops running. Now I found in my logs a hint. It is stopped round about midnight. Please see last line. Do you have an idea why? And what can I do?

235339       : #> /usr/bin/wget --hsts-file=/tmp/.wget-hsts -nv -t 1 -O /var/run/ddns/mxxxv6.dat -o /var/run/ddns/mgxxxnv6.err --no-proxy 'http://ipv4.wtfismyip.com/text'
 235339       : Current IP '71.222.163.204' detected on web at 'http://ipv4.wtfismyip.com/text'
 235339       : Waiting 300 seconds (Check Interval)
 235839       : Detect registered/public IP
 235839       : #> /usr/bin/drill -V0 -u mxxxnv6.net A >/var/run/ddns/mgxxx6.dat 2>/var/run/ddns/mgxxxnv6.err
 235839       : Registered IP '71.222.163.204' detected
 235840  info : Rerun IP check at 2025-06-08 23:58
 235840       : Detect current IP on 'web'
 235840       : #> /usr/bin/wget --hsts-file=/tmp/.wget-hsts -nv -t 1 -O /var/run/ddns/mgxxxynv6.dat -o /var/run/ddns/mgxdynv6.err --no-proxy 'http://ipv4.wtfismyip.com/text'
 235840       : Current IP '71.222.163.204' detected on web at 'http://ipv4.wtfismyip.com/text'
 235840       : Waiting 300 seconds (Check Interval)
 000340       : Detect registered/public IP
 000340       : #> /usr/bin/drill -V0 -u mgdtm33.dynv6.net A >/var/run/ddns/mgdtm33dynv6.dat 2>/var/run/ddns/mgdtm33dynv6.err
 000340       : Registered IP '71.222.163.204' detected
 000340  info : Rerun IP check at 2025-06-09 00:03
 000340       : Detect current IP on 'web'
 000340       : #> /usr/bin/wget --hsts-file=/tmp/.wget-hsts -nv -t 1 -O /var/run/ddns/mxxxnv6.dat -o /var/run/ddns/mgxxxdynv6.err --no-proxy 'http://ipv4.wtfismyip.com/text'
 000341       : Current IP '71.222.163.204' detected on web at 'http://ipv4.wtfismyip.com/text'
 000341       : Waiting 300 seconds (Check Interval)
 **000501  note : PID '19167' terminated by 'SIGTERM' at 2025-06-09 00:05**