After a while Cache is not writeable

Hi!

I have a strange problem with my cakephp-Installation on Ubuntu 10.04
Server: Everything works fine but after a while i get the warning:

fopen(/rootdir/cakephp/app/tmp/cache/persistent/cake_core_default_de-
de) [function.fopen]: failed to open stream: Permission denied [CORE/
cake/libs/cache/file.php, line 142]

If i examine the file its owned by root.

Then i set the right owner (www-data) and everything works fine (for a
while). I cant figure out what happen. Everything else (tmp-Dir,
cachedir a.s.o.) is not affected...only the above file.

Thanks!

Best regards,
Kai.

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