LE seems to get data for the first frequencies, but afterwards no more data are coming in.
Code
Jun 23 13:00:56.422423 LibreELEC tvheadend[436]: mpegts: 704.5MHz in DVB-T Network - tuning on DiBcom 7000PC #0 : DVB-T #0
Jun 23 13:00:56.422510 LibreELEC tvheadend[436]: subscription: 0001: "epggrab" subscribing to mux "704.5MHz", weight: 4, adapter: "DiBcom 7000PC #0 : DVB-T #0", network: "DVB-T Network", service: "Raw PID Subscription"
Jun 23 13:00:56.422531 LibreELEC tvheadend[436]: mpegts: 634.5MHz in DVB-T Network - tuning on DiBcom 7000PC #1 : DVB-T #0
Jun 23 13:00:56.422548 LibreELEC tvheadend[436]: subscription: 0002: "epggrab" subscribing to mux "634.5MHz", weight: 4, adapter: "DiBcom 7000PC #1 : DVB-T #0", network: "DVB-T Network", service: "Raw PID Subscription"
Jun 23 13:00:59.435701 LibreELEC tvheadend[436]: htsp: Got connection from 127.0.0.1
Jun 23 13:00:59.435807 LibreELEC tvheadend[436]: htsp: 127.0.0.1: Welcomed client software: Kodi Media Center (HTSPv35)
Jun 23 13:00:59.435829 LibreELEC tvheadend[436]: htsp: Got connection from 127.0.0.1
Jun 23 13:00:59.435864 LibreELEC tvheadend[436]: htsp: 127.0.0.1 [ Kodi Media Center ]: Identified as user ''
Jun 23 13:00:59.435881 LibreELEC tvheadend[436]: htsp: 127.0.0.1: Welcomed client software: Kodi Media Center (HTSPv35)
Jun 23 13:00:59.437605 LibreELEC tvheadend[436]: htsp: 127.0.0.1 [ Kodi Media Center ]: Identified as user ''
Jun 23 13:01:23.644671 LibreELEC systemd[1]: systemd-hostnamed.service: Deactivated successfully.
Jun 23 13:02:31.401301 LibreELEC tvheadend[436]: mpegts: 767.5MHz in DVB-T Network - tuning on DiBcom 7000PC #1 : DVB-T #0
Jun 23 13:02:31.401632 LibreELEC tvheadend[436]: subscription: 0002: "epggrab" unsubscribing
Jun 23 13:02:31.402006 LibreELEC tvheadend[436]: subscription: 0004: "scan" subscribing to mux "767.5MHz", weight: 6, adapter: "DiBcom 7000PC #1 : DVB-T #0", network: "DVB-T Network", service: "Raw PID Subscription"
Jun 23 13:02:31.402340 LibreELEC tvheadend[436]: mpegts: 725.5MHz in DVB-T Network - tuning on DiBcom 7000PC #0 : DVB-T #0
Jun 23 13:02:31.402523 LibreELEC tvheadend[436]: subscription: 0001: "epggrab" unsubscribing
Jun 23 13:02:31.402740 LibreELEC tvheadend[436]: subscription: 0005: "scan" subscribing to mux "725.5MHz", weight: 6, adapter: "DiBcom 7000PC #0 : DVB-T #0", network: "DVB-T Network", service: "Raw PID Subscription"
Jun 23 13:02:36.876663 LibreELEC tvheadend[436]: mpegts: 725.5MHz in DVB-T Network - scan no data, failed
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Maybe undervoltage inside of the receiver?
Please provide a product link of your DiBkom 7000PC. Does it have an optional PSU, which you can plug in?