I had a similar issue with As LFG4 Cards.

Two years ago sent 2 servers to South America with a US Flypack. Those servers had LFG4 cards and I saw the same problems. Specifically the driver working then not. On two machines we had 6 cards for 12 inputs on each machine. On every load-in, I had to fix at least one system. By the 5th show we got a power conditioner for the whole video system and ran fibre to the projectors. When we did the problems dropped off but I still had to replace 2 cards.