[SQU] Watermarks ignored?

Hello,
We've a squid 2.3STABLE4 proxy running on Solaris 2.6 on sparc.
We have a problem though, sooner or later one of the disks reaches 100% capacity and then squid dies.
We had the same problem with 2.3STABLE3 (patched with squid-2.3.stable3-storeExpiredReferenceAge.patch).
But not with the 2.2STABLEx.
Our configuration is standard, the only feature in use is --with-sync-io=64, the server is dual cpu and has 4x9GB
cache disks.
We have:
cache_dir asyncufs /cacheX 8450 16 256
for all disks (8450K it's less than the actual fs size)
And we have:
cache_swap_high 94
cache_swap_low 90
We're desperately looking for solution, please help, thank you in advance,

 Sincerely,
 Zeev Meloch

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