Sleeper/GV 33.6 Speakerphone problem

Here's a real winner of a problem that's got me baffled.

I have a PowerMac 8100/100AV with a 256k L2 cache and 32MB of RAM and using System 7.5.5. I am
running the new GV Speakerphone 33.6 and I use Sleeper (a Screen Saver
and Disk Spindown utility) version 2.1.1.

If I use the Disk Spindown part of Sleeper, after a certain amount of
time, my Mac no longer recognizes that the GV Phone Engine extension has
loaded. So if someone tries to call me, the following error message
appears:

"The application "unknown" has unexpectantly quit because an error of
type 1 occured."

This effectively hangs the machine until I get home to click the "OK"
button. When I click the "OK" button, I get a second window which says
the following:

"Global Village Call Center could not start because the GV Phone Engine
Extension is not running. Use the Extensions Manager to turn on the GV
Phone Engine and restart your computer or reinstall the Call Center
software."

These events do not occur unless the disk has spun down *and* sat there
for a while. I have checked for conflicts, I have tried reinstalling the
software, I think I have tried everything. Have I ?

Is this actually a memory problem of some kind ("type 1") ?

This never happened to me using Megaphone with my Geopod, but then
again, that application had to be running to answer the phone and this
one did not. (Plus, I had a whole *bunch* of other problems with the
Geopod!)

I use the Disk Spindown feature only to save energy. I'm not worried
about HD wear. Should I just leave it Spin or is there a solution or
workaround?

Thanks in advance for your help!