The latest firmware update, which can only be done through USB, is available on the Onkyo website for the Onkyo TXNR616 and TXNR515. This WILL FIX the HDMI issue of picture loss.  I have personally done this on various projects and have field tested it for weeks now.

Onkyo receivers are the best value in the receiver market in my opinion. If you been in this business for a long time you can name issues with every brand at different years with different models. This is no different.  Just felt I had to defend Onkyo a bit because I could name issues with other major brands.