Uninstall every app. Or do a fresh wipe with NO apps. Flash this patch. Install only GPS Status. Make sure it's a good solid & stable lock. Try GMaps for a bit.
Also if the screen times out (goes black) your GPS will probably shut off. So consider that with your issue if you haven't yet.
I tried this as well with no luck. I left it on GPS status all night and it was fine. I went into navigator and lost the connection. The screen stays on.
Seems this problem is reported here
http://code.google.com/p/cyanogenmo...Summary Stars Priority&groupby=&sort=&id=4299