[sentinix-list] Apache stops running

I've checked the error.log of the apache server and beside of different
Cacti-PHP errors I get :

[Mon Mar 15 13:12:33 2004] [error] System: Connection reset by peer (errno:
104)
[Mon Mar 15 13:13:36 2004] [error] mod_ssl: SSL handshake interrupted by
system [Hint: Stop button pressed in browser?!] (System error follows)


but the last >200 entries are:

libpng error: Write Error
libpng error: stream error
libpng error: stream error
libpng error: stream error
libpng error: stream error
libpng error: stream error
libpng error: stream error
libpng error: stream error

Any ideas to fix ?

Thanks

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