AirTunes audio keep dropping out from my AE streaming...

I am using 3AE's for streaming audio from iTunes wirelessly. Been working fine but started dropping audio out intermittently. When it happens, the airtunes control shows no names for thoes AE's dropped out... but I see placeholders. Sometimes never come back and have to restart my iTunes... It's super annoying this happening to me. Is there anyting I can do to address this issue? Anyone?