Did the system EVER work reliably? If so, it's likely not a programming problem...It's more likely a physical hardware issue. This could be as simple as an AUX Repeater that's gotten unplugged or dropped a PSU, a network conflict disrupting communications between two Main Repeaters on the LAN [if this is the topology] or a failed dimmer.

Regardless I'd certainly want a copy of the programming as a reference, even if you plan to start over...