Can confirm that I have been having this issue as well and could likewise find nothing on it. Has happened on the multiplayer server I play on about 5 times now. Personally I'm powering mine through an extreme reactors reactor plugged in through an ender io conduit, but same issue plugged into a fluxduct from thermal expansion. This happens everytime I come back onto the server if it has turned off. I've tried chunkloading with a mekanism digital miner but to no avail.