I have a case where a X440 8-p switch is connected to 2 tvs , 2 phones and a wifi. There are about 350 switches connected in the same manner . Some tvs randomly hangs in some rooms. It becomes fine once the phones or wifi is disconnected and reboot the switch or the tv is switched off and on back again. The specific port connected to the hanging tv is working when connected to another tv.. IGMP snooping is disabled for the other vlans except IPTV. Snooping filters are configured per-vlan..My switch version is 16.2. The two phones are giving a speed of 100 Mbps and wifi is 1000Mbps..Expecting suggestions..