Unusual activity is firewall block traffic

Ok for some time now i been getting alot of unusual traffic being blocked, not sure what it could be but i am concerned, here is what i have just to show a few:

8/6/2019 4:37:33 PM	192.168.1.69	50037	239.255.255.250	1900	UDP	In	C:\Windows\System32\svchost.exe	Public Tcp/Udp In Block

get tons of these and tons of these:

8/6/2019 4:37:42 PM	2600:1700:31c0:1000::1	-	2600:1700:31c0:1000:d87b:c87:dc27:e8c5	1	ICMPv6	Out		Public Icmp6 Destination Unreachable Out Block

What are they? i’m concerned