Maytag Bravos washer rattles when it hits rinse cycle and will no

It started by giving a Ld error code. I pulled the pump out to check for blockages and chekced the drain hoses. The unit drained onto the floor, and I didn't find any blockages in the hoses, and the pump is not rattling, nothing was in it, and all the propellers were intacked. Put the unit back together. Ran the rinse and spin cycle completely through, (empty tub) and it completed the cycle w/ no error code. I put a medium sized load of tee shirts and cotton shorts and a few socks in and started a normal wash cycle. At 26 minutes left (the beginning of the rinse cycle) the unit began to rattle and would not continue. unplugged, emptied tub of clothing, again disconnected pump and drain hoses, and reconnected after still not finding a blockage, or anything that should not have been there. Reconnected everything, inside the tub there was a nut attached to the impeller, took out thinking I would be able to see if anything is stuck inside, but that was not the case, reattached, ran the rinse/spin cycle completely, cycle finished. Put clothes back in unit, started normal cycle, stopped again at 26 minutes, rattling. unplugged unit, plugged in tried to run the rinse and spin cycle only (with clothes in tub) it rattled and did nothing else. Unplugged, plugged back in tried to run the spin only cycle (clothes in tub) and it did nothing but rattle.