Ive had a number of Luminex boxes suffer from 'crashes' due to voltage drop on the internal power supply. I've had to replace a number of Node8's on shows, where they've just 'frozen', with Artistic Licence products

I can recommend the Artistic Licence Range of DMX/Artnet products:
Cata-Lynx
http://www.artisticlicence.com/index..._id=&order_id=

Ether-lynxII
http://www.artisticlicence.com/index..._id=&order_id=

Data-Lynx
http://www.artisticlicence.com/index..._id=&order_id=

Do contact me if you require further infotmation or pricing.

Simon