Windows 7 home premium fast machine with 4GB memory: Music is stored in Applelossless transcoded on fly by Asset to PCM as receiver cannot handless M4a format directly.

A variety of issues:
- Asset R4 routinely becomes unresponsive when accessing it from Yamaha RX-A2000 AVR or its IPAD app. Will often play first song selected but upon trying to accessing a new artist or track it is slow to complete hang. I've tried uninstalling, reinstalling, rebooted, cleaned register, deleted config file in windows system32, etc. to no avail - same issue kept occuring. Rolled back to R3 and R3 works without this issue - very responsive and no hangs.

- Asset is sometimes not seen by receiver, but Windows Media player is? Sometimes have to reboot PC, unplug/plug-in receiver to get it to see it again. Happens with both R3 and R4.