ok so ive notice 2 buggs with the miner lately 1 when you save and exit and reload the world not matter the time differnace the miner seems to think its done mining and requires a reset to start backup and at the same time it will lose connection to the universal cables. it dose this also if you were to for example go to the nether and come back even if there is a chunk loader present to keep the chunks there. the loader i use is the chickenchunks mod from the same ones who made NEI(not enough items mod). it just seems to keep resting and losing power connections. but i have notice it may keep them if you use a direct power connection or something like the dimensional transceiver from ender io. this also seems to only happen in the overworld i know it works fine in all aspects in the nether and the end not sure for mod worlds.

These bugs are reported already, they will hopefully be fixed soon.