I've got a miner running and it appears to have stopped extracting materials. It's not a liquid problem as I have a pump beside it (which shows a full water gauge but hasn't filled any of the cells in its inventory or the chest beside its inventory). The miner has worked great for awhile, the mineral yield has dropped from 85 to 6, but now that it's not doing anything I'd expect it to retract and give me back my mining pipes like the wiki says it will, but it hasn't. How can I get it to shut down and give me back my pipes???