Fixing SONOS "Unable to play" song / "Unable to connect" to local music library problem on Windows 7

In general, I've been quite pleased with my Sonos units, but I've been plagued with a problem accessing my personal music library for more than a few days at a time. I think i have a fix for my problems now.

I run the Sonos application on a Windows 7 machine which I use as a file server and media server (running a variety of transcoding software for various devices around the house). My music library is stored on a local drive on that machine (this detail is probably unimportant as Sonos never accesses the library locally and always uses the network share for the library). My first problem was the Error 900 problem which occurs when the stack size of the network server is too small to buffer the data (or something). The solution was to use regedit (Start->Run->regedit.exe) and modify key:
Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\LanmanServer\Parameters\IRPStackSize
from the default value of 15 (decimal) to either 18 or 24 (decimal). I upped mine to 24 and it got rid of the Error 900 problem, but I would still routinely lose connection to the music library. (See Sonos Error 900 FAQ.)

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Fixing SONOS "Unable to play" song / "Unable to connect" to local music library problem on Windows 7