@vpm, It sounds like the new Cary App is causing these streaming issues and I am surprised they have not been able to help. I still do not understand why you and only one other person are having these issues using the Cary Audio DMS-600. You would think many more Cary users would have these issues. It sounds like the issue is caused by the Cary Streamer 2.0 app and I suggest you contact them again for assistance.
Please also double check the settings in the Streamer 2.0 app to ensure everything is set correctly. Something might of been changed during the update.
IMPORTANT-1: I also found these instructions on the Cary website:
"Updating Firmware
These are big changes to the firmware. After you have successfully updated the firmware, it is highly recommended to then do a Factory Reset from the handheld IR remote (Menu>>Reset). Once the factory reset is complete and your unit has booted up, pull the power cord and leave it UNPLUGGED for 5 minutes. Plug it back in and wait 2 minutes before turning the unit on again.
NOTE: You will have to reconnect to Wi-Fi (if you use Wi-Fi instead of ethernet) and your music streaming services. Additionally, any USB, SD, or PC Share drives will need to rescan".
VERY IMPORTANT-2: "After you have done the update and Factory Reset of your DMS/AiOS, completely DELETE the Cary Streamer app from your phone or tablet then download the latest app called Cary Streamer 2.0. This new app REQUIRES you have location service turned on while using the app".
I also suggest you contact the Retailer where you purchased your Cary Audio DMS-600. I am hoping they can help.
Many years ago, I also had similar streaming issues and it was caused my Linksys router. The Linksys software/firmware had an issue and was dropping packets. It was a known issue and they were working on a solution. In any case, I replaced my router and my streaming worked perfectly. In your case, I do not know if the router is the cause but it might be worth some investigation.