Marty,

I had a similar problem with Mezzmo disappearing after a couple of sleep/resumes of its server pc. The remedy for me - suggested by Peter from Conceiva - has been to set a 'server advertisement interval' under Media Server Settings to something like 180 (3 mins).

Now - if Mezzmo is not visible at the beginning it will announce itself after latest 3 mins (in my case). This fix has now worked for me for many months without negative side effects.