Works well for days normally though today it died after 12 hours, then the stratum.log adjusts difficulty and then comes up invalid as shown below.
2017-10-02 14:18:05,241 DEBUG interfaces # 3918d52af820e52b5a0454adf31e67e30d5893a481c636505d269ad0604469d0 (1887) valid kakala.kakala
2017-10-02 14:18:05,242 DEBUG DB_Mysql # Finding user with id or username of oso.1
2017-10-02 14:18:05,243 DEBUG mining # oso.1 (1981, 4, False, False, 1506967990) 0.20% work_id(c3a6) job_id(c3a6) diff(1024.000000)
2017-10-02 14:18:05,245 DEBUG BasicShareLimiter # Checking Retarget for oso.1 (1024) avg. 0 target 15+-4
2017-10-02 14:18:05,246 WARNING BasicShareLimiter # Reseting avg = 1 since it's SOOO low
2017-10-02 14:18:05,247 DEBUG BasicShareLimiter # Retarget for oso.1 1 old: 1024 new: 1024
2017-10-02 14:18:05,247 DEBUG template_registry # Getting Laat Template
2017-10-02 14:18:05,249 DEBUG BasicShareLimiter # Notified of New Difficulty
2017-10-02 14:18:05,250 DEBUG BasicShareLimiter # Sent new work
2017-10-02 14:18:05,252 INFO DBInterface # Inserting 50 Share Records
2017-10-02 14:18:05,252 DEBUG DB_Mysql # Importing Shares
2017-10-02 14:18:05,251 DEBUG DB_Mysql # Setting difficulty for oso.1 to 1024
2017-10-02 14:18:05,255 INFO template_registry # Job id 'c3a6' not found
2017-10-02 14:18:05,255 DEBUG interfaces # False (0) INVALID oso.1
2017-10-02 14:18:05,257 DEBUG DB_Mysql # Finding user with id or username of oso.1
2017-10-02 14:18:05,283 DEBUG mining # oso.1 (1981, 5, False, False, 1506967990) 0.25% work_id(c3a6) job_id(c3a6) diff(1024.000000)
2017-10-02 14:18:05,283 INFO template_registry # Job id 'c3a6' not found
Further along in the log we get these errors and no miners can connect.
2017-10-02 14:52:46,019 DEBUG template_registry # Getting Unique Extranonce
2017-10-02 14:52:46,019 DEBUG template_registry # Getting Laat Template
2017-10-02 14:52:46,019 DEBUG template_registry # Getting Unique Extranonce
2017-10-02 14:52:46,019 DEBUG template_registry # Getting Laat Template
2017-10-02 14:52:46,022 ERROR bitcoin_rpc_manager # Check Height -- Pool 0 Down!
2017-10-02 14:52:47,023 ERROR bitcoin_rpc_manager # Problem with Pool 0 -- NO ALTERNATE POOLS!!!
2017-10-02 14:52:51,030 ERROR bitcoin_rpc_manager # Check Height -- Pool 0 Down!
2017-10-02 14:52:52,031 ERROR bitcoin_rpc_manager # Problem with Pool 0 -- NO ALTERNATE POOLS!!!
2017-10-02 14:52:56,087 ERROR bitcoin_rpc_manager # Check Height -- Pool 0 Down!