If you cannot connect remotely again, try to access the miner, with a PC on the same network, as the Futurebit. If this fails, then try to ping it and last use a IP scanner to see all the devices, within your netwok.
Tried this. When the issue happens it dissapears from the ip scanner as well. Happened again for the 4th time last night. Just turned it off at this point and emailed support. Obviously I have a faulty unit so hopefully they will come through and give me a way to send it back for a fix or replacement since its only been in my home for around 30 days