I have 5 Stairville block 405, it m'ontpos the problem two years ago, as another person on the opinions of Stairville 405, Lumire do more cutting oune more lights! It is very Gnant when there are 800 people in the room and that all scaffold bricoller block to rekindle the light. IN GENERAL I unplug the unit and reconnects and I repaired for a time uncertain. Unlike another review, I use yet as DMX cables Hot Specials and this does not mean that the problems do not exist. I sent my 5 blocks in Germany two years ago and now has again now! Yet I have isolated the console by optical splitter, but I think an interference by a block on all the other blocks upstream and downstream. I do not know what to do with these 5 blocks!