Interesting. I have my Playmaker now since 5 weeks and had ZERO dropouts.
I have my music library on a WD Live Book, served by the built in Twonky server.
My DLNA device is a Lenovo Yoga Tablet, running BubbleUpnp.
Everything (except the WD Live Book) is linked wirelessly. I am using a dedicated router as a wireless access point (WAP). The WAP is 5 m away from the Playmaker, which gives it a strong signal.
All devices never change their IP address. I am using the router built-in feature "Always use same IP Adress for device" (based on MAC address).
Bernd