The miner didn't switch to the backup pool after one of ethermine's servers dropped. Needed a manual restart:

17555:00:58:07.986: main GPUs: 1: 29.930 MH/s (902/1) 2: 28.957 MH/s (845) 3: 28.905 MH/s (872) 4: 30.118 MH/s (841) 5: 28.908 MH/s (919) 6: 28.902 MH/s (925/1)
17555:00:58:09.584: eths Eth: Send: {"id":5,"jsonrpc":"2.0","method":"eth_getWork","params":[]}

17555:00:58:09.593: eths Eth: Unable to read pool response: An existing connection was forcibly closed by the remote host
17555:00:58:09.593: eths Eth: Reconnecting in 10 seconds...
17555:00:58:15.883: main GPU1: 66C 32%, GPU2: 67C 18%, GPU3: 66C 33%, GPU4: 66C 32%, GPU5: 61C 17%, GPU6: 59C 17%
17555:00:58:17.866: GPU4 Unable to submit share - pool disconnected
17555:00:58:19.596: unkn Eth: Connecting to ethash pool eu1.ethermine.org:4444
17555:00:58:19.622: eths Eth: Connected to ethash pool eu1.ethermine.org:4444
17555:00:58:19.622: eths Eth: Send: {"id":1,"jsonrpc":"2.0","method":"eth_submitLogin","worker":"pmethash","params":["0x40EDA1a5924f22CB5C267cbc13525daf46635672.RX2"]}

17555:00:58:25.334: GPU6 Unable to submit share - pool disconnected
17555:00:58:44.057: main GPU1: 66C 32%, GPU2: 66C 19%, GPU3: 66C 34%, GPU4: 66C 32%, GPU5: 61C 17%, GPU6: 59C 17%
17555:00:59:12.123: main GPU1: 66C 32%, GPU2: 66C 18%, GPU3: 66C 33%, GPU4: 66C 33%, GPU5: 61C 17%, GPU6: 59C 17%
17555:00:59:40.302: main GPU1: 66C 33%, GPU2: 66C 18%, GPU3: 66C 34%, GPU4: 66C 32%, GPU5: 62C 17%, GPU6: 59C 17%
17555:00:59:45.489: GPU1 Unable to submit share - pool disconnected
17555:01:00:08.372: main GPU1: 66C 32%, GPU2: 66C 18%, GPU3: 66C 34%, GPU4: 66C 32%, GPU5: 62C 17%, GPU6: 59C 17%
17555:01:00:14.301: GPU1 Unable to submit share - pool disconnected
17555:01:00:17.404: GPU2 Unable to submit share - pool disconnected
17555:01:00:30.295: GPU5 Unable to submit share - pool disconnected
17555:01:00:35.082: GPU1 Unable to submit share - pool disconnected


About the dual mining - IMO it is no longer worth it because there are ASICs for those coins. If you manage to include another algorithm - I'm sure that you'll get even more users.