I've got a Zephyr unit that has had the programmingg track function repaired last month, I kept getting an Open Circuit error. Digitrax repaired under warranty and I've been using it for the last 2 1/2 weeks problem free. This past weekend the programming track failed AGAIN:curse: . Has anyone out there had the same problem with their Zephyr unit or do I have a lemon? It is really becomming annoying:cry: . I'm thinking of returning it and getting the MRC advance system.