I don't know, but I have the very same problem with my new Theta Carmen. It's quite annoying.
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Two potential sources of the problem. 1. the laser needs to be cleaned. Try spraying it with compresssed air. That works for my players. 2. some part of the transport mechanism, e.g., the rails, is(are) worn, defective, or just needs to be lubricated. I have an old meridian 506 that I had to send back to the distributor to be repaired.
Try cleaning the laser first. If that doesnt work, likely it needs servicing.
Another possibility is that the power being fed to the laser or the laser itself is sagging under load. Lasers do burn out or "go soft" after a while, so it is possible that you may have to either juice up the power supply to it in order to keep it alive. If that is the case, the laser is on its' last leg and you really need to find a replacement assy for it if you would like to keep the machine up and running.
Since most of the older machines shared common parts, this might not be too hard to do if you can find someone knowledgable in your area. They should be able to tell you who made the laser assy and what model it is. Once you've figured that out, you might be able to order a brand new one or be able to swap one out of another machine that you pick up for a "steal" due to its' age. Sean