Disable DCM, perhaps you have some channel clashes and DCM is removing/adding channels in the ABC lineup and getting in a pickle. If you are running the latest firmware, your timers should still be there, but flagged for you to edit them to point back to a known working ABC channel. I would suggest running the latest firmware a doing a FULL channel scan, it will detect clashes and deal with them better than any of the older firmwares.
Regards