Static IP set in /etc/network/interfaces sometimes doesn't set properly after reboot

[Matinal Sun]

I use ubuntu20.04 and set static IP 192.168.11.22 in /etc/network/interfaces. Most time it could work but sometimes the IP changed to 192.168.11.105, which same to be a DHCP IP. I checked the syslog and journalctl, find that eth0 same to disconnect and be re-configured by dhcilent.:

Oct 22 10:10:03 sv-host NetworkManager[502]: <info> [1634868603.0490] device (eth0): link disconnected (calling deferred action)
Oct 22 10:10:03 sv-host NetworkManager[502]: <info> [1634868603.0498] device (eth0): state change: activated -> unavailable (reason 'carrier-changed') [100 20 40]

But I don't know which lead eth0 disconnect. Why eth0 doesn't get static IP but DHCP IP when it reconnected?