Error in 2.3.DEVEL3

Hi,
I'm using squid 2.3.DEVEL3 since many months ahd I never had any trouble,
but this morning I found that in logs:
2000/01/10 12:30:30| WARNING: Disk space over limit: 178042283 KB > 3584000
KB

I tried to restart the squid, I tried to delete all /var/spool/squid and
recreate them from scratch witch squid -z but all dosn't work at
all...anyone can suggests me what's causing this error ?
Well...of course the right size of cache is 3.5GB...

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