Thread:Veenster7/@comment-31168536-20170316051931/@comment--20170316195209

Your IP(s) must be a dynamic host control protocol (DHCP) which means you change IP's from time to time. Meaning you've switched to an IP that was blocked on the site.

If you're still having issues with adding a comment, then you can use Special:Contact/general along with providing the block ID and Staff will more than likely lift it for you.