[mod_python] Intermittent stops

Hi All,

I'm having issues with one particular instance of Apache 2.0.54 on
win2003 where mod_python stops working at some point.  The log file
shows :

make_obcallback: could not import mod_python.apache.\n
[Fri Dec 05 17:20:56 2008] [error] python_handler: no interpreter
callback found.
[Fri Dec 05 17:20:56 2008] [error] [client x.x.x.x] python_handler:
Can't get/create interpreter., 

Problem is whe I start/restart Apache mod_python gets loaded properly
and works for some amount of time :

mod_python: Creating 8 session mutexes based on 0 max processes and 250
max threads.
[Fri Dec 05 17:24:57 2008] [notice] Apache/2.0.54 (Win32)
mod_python/3.2.7 Python/2.4.4 PHP/5.2.1 configured -- resuming normal
operations

I have a similar set up on another machine (an XP machine) and
mod_python never stops working.  I suspect some PHP error mixes things
up in the Apache environment, but I'm not sure.  Are there known issues
for win2003 ?  

TIA,

Yves Moisan