Lock keeps unlocking

Hey all,

I'm running SH3 with GWX Gold and OLC Gold on XP, and I'm running it to problems when I try to lock either of the scopes onto a target. It will stay locked for a couple of seconds, before unlocking itself. This makes it difficult to do much of anything, and I would be extremely grateful if anyone knew why this was happening.

Thanks in advance,

Wibbs