Problem connecting on video chat AIM account/Messages
I've recently upgraded to a new iMac (27" Retina, 3.5ghz i5). I'm running Yosemite 10.10.3.
After years of successful and problem-free video chatting with family using an AIM account with Messages (and iChat before that), I'm suddenly having connection issues.
Curiously, I'm able to connect on my first attempt of the day. The video and audio work wonderfully, the chat can go on as long as desired, etc.
With every subsequent attempt to connect, the video chat will *not* connect.
I've deleted and re-added my aim account multiple times. Clearly my router is allowing the video chatting since a) I never had a problem in 8+ years previously with several different macs and b) I am even able to connect on this Mac, albeit intermittently.
I would welcome any advice.
iMac (Retina 5K, 27-inch, Late 2014), OS X Yosemite (10.10.3)