How are the splitters powered? I would also check that the splitters are being powered by a supply with enough current to drive them. Under voltage and/or under current can make electronics perform erracticaly. The time lag makes me wonder if there could be a temprature dependent fault. After the hour the components will have cooled down. But if you switch off then straight back on they are still warm. Another thing to check which you probably have done already is the DMX line correctly terminated. This depends on how your splitters are set up. If splitter 2 is daisy chained off splitter 1 then only splitter 2 should have a terminator at the end of the Dmx line from the board. If your splitter is set up so each leg is an independent Dmx line then the end of each leg should be terminated. For termination I mean either with an external terminator or internal terminator in the fixture switched in. If you are able to let us know what brand of fixtures, splitters, lighting board you are using people may be able to help you more.
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