Bravia KDL-70R550A no longer able to access Serviio

I have a Bravia (KDL-70R550A). Serviio has run with no problems for at least a year on the Bravia. Then, suddenly, the Serviio become "not accessible" about a month ago. Half the time the Serviio logo doesn't even show up in my list of media servers. Even if it does and I click on it, the TV searches and comes back with "server not accessible."

I have a Samsung TV that has had the same problem. We also have a Playstation 3 connected to a third TV that sometimes can/cannot see Serviio. With the Playstation, if I stop, then start the Serviio server it will see and use it with no problems.

The only recent change on my Windows 8 computer was a switch to Kaspersky Pure 3.0 from AVG.

I am not nearly as tech-savvy as most of the people in this forum so hopefully any responses to my question can be "dumbed down" for me.

Any help anyone can offer would be greatly appreciated!!

AVG - at least in the free version - doesn't bring a firewall component. Can we assume that "suddenly" and "recent change" happened at roughly the same time, about a month ago?

Maybe the new security suite is a bit too protective. Can you disable it temporarily to see if you can access Serviio in a more reliable way?