Troubles with Digi Anywhere USB 14

Sorry for my English, it is rather bad!

We are using Digi anywhereUSB\14 with last firmware and 4 hosts with last drivers 32 and 64 bit. Sometimes system status LED blinks red, we have to reboot it, after that it works normally for recent hours, but soon comes down. What we can do?

Why type of USB devices do you have connected to the AnywhereUSB/14?

What is the network speed and duplex mode set to on the AnywhereUSB/14 and network switch port?

Settings AnywhereUSB of eth0:
speed: auto,
duplex-mode was half-duplex, we changed it to auto.

We are using 4 Flashcards in it with keys to Software