I've had this problem for almost 2 years. The CTX will be working fine then I suddenly realize I'm not picking up signals. Same problem when I change coils. Have sent to ML twice. They send it back saying no problem found but it typically does not begin until I'm 30 minutes into a hunt so I can see why they can't find it. I'm suspicious there's a problem where the connector on the processor hooks to the coil. This machine is too expensive to have to keep sending back. Help! (ps wont come through w/o speakers either so no problem there).