PHPA causing problems?

I was having frequent "out of memory" errors on my site, and Apache would randomly quit after one or two days of uptime. After disabling PHPA, everything seems to be working perfectly. Just did a HEAD request on another site which is known for errors like this, and sure enough, the X-accelerated-by header is "PHPA/1.3.3r2". Is there some sort of misconfiguration in PHPA that causes issues like this, or is it simply a bad product? -- The above message is encrypted with double rot13 encoding. Any unauthorized attempt to decrypt it will be prosecuted to the full extent of the law.