I have seen some references to a memory issue in NW 6.5 SP5.

Something about memory auto-tuning failing or not working.

I went through all the memory leaks in pre-sp1 and again in SP2, this
seemed to be fixed in SP3, which most of my servers are at. I have begun to
upgrade them all to SP5, but a couple servers have abended and crashed
since upgrading to SP5 and a couple are getting the dreaded "Cache memory
allocator out of available memory" nonsense again.

Is there some sort of patch or something I can do to fix this issue? I
thought this had been fixed in SP3, as I have been pretty happy with server
performance since SP3 (hence, why I did not apply sp4).

All of my servers have 4 gigs of memory.