proxy abends

Hi,

We are experiencing proxy abends the last months. (every 4 a 5 days)
We need to reboot the server every time to get rid of the abend, which is
affecting only s2s vpn performance.

Server details :
nw65sp7, bm39sp1, 4 gb ram, proxy/vpn

I already updated the wsocko patch, but that does not work.

Any hints to troubleshoot this?
I prefer not to update to sp8 yet.

regards,
Marcel