MPH doesn't seem to work for me anymore. Whenever mph pool is active it will start to fail in minutes with the messages log on the z9 spewing out the following lines:
Jun 28 21:40:36 (none) local0.warn cgminer[7381]: Pool 0 stratum+tcp://us-east.equihash-hub.miningpoolhub.com:17023 alive, testing stability
Jun 28 21:40:36 (none) local0.warn cgminer[7381]: Switching to pool 0 stratum+tcp://us-east.equihash-hub.miningpoolhub.com:17023
Jun 28 21:40:37 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 50005d25
Jun 28 21:40:39 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 50004918
Jun 28 21:40:42 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 50005736
Jun 28 21:40:45 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 50003a1b
Jun 28 21:40:54 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 500059d9
Jun 28 21:41:02 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 50003f39
Jun 28 21:41:12 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 50004b27
Jun 28 21:41:19 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 5000519e
Jun 28 21:41:26 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 50005217
Jun 28 21:41:29 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 500043ec
Jun 28 21:41:31 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 500046d2
Jun 28 21:41:38 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 500056fa
Jun 28 21:41:40 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 5000550c
Jun 28 21:41:46 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 50005648
Jun 28 21:41:48 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 50004ab8
Jun 28 21:41:50 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 50003a58
Jun 28 21:41:53 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 50005c8e
Jun 28 21:41:59 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 50003f5c
Jun 28 21:42:06 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 500057ea
Jun 28 21:42:13 (none) local0.notice cgminer[7381]: Pool 0 extranonce set to 50004be8
Jun 28 21:42:13 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Jun 28 21:42:13 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Jun 28 21:42:14 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Jun 28 21:42:14 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Jun 28 21:42:14 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Jun 28 21:42:14 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Jun 28 21:42:14 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Jun 28 21:42:14 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Jun 28 21:42:14 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Jun 28 21:42:14 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Jun 28 21:42:14 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Jun 28 21:42:14 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Jun 28 21:42:14 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Jun 28 21:42:14 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Jun 28 21:42:14 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Jun 28 21:42:14 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Jun 28 21:42:14 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Jun 28 21:42:14 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Jun 28 21:42:14 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Jun 28 21:42:14 (none) local0.warn cgminer[7381]: nonce_handle: nonce fifo full!!!
Restart didn't help. Switching from europe to us-east didn't either. Mining on flypool for now which gives no issues at all.