We are using squid proxy server in Linux and server is getting hang often, during this time when see the log file it will show like below

Please address this issue and give me a solution
Thanks

Jul 23 11:52:26 Linux-GW avahi-daemon[2028]: Invalid response packet from host 192.168.1.154.
Jul 23 11:54:55 Linux-GW avahi-daemon[2028]: Invalid response packet from host 192.168.1.154.
Jul 23 12:36:07 Linux-GW avahi-daemon[2028]: Invalid response packet from host 192.168.1.154.
Jul 23 12:38:52 Linux-GW last message repeated 2 times