Poster exit due to trn_cleanup_by_que() failure on Oracle error : ORA-02396 (4263839)

Error    2017-01-23 16:28:12.575154 14876732 1 Poster: 15014 - Poster exit due to trn_cleanup_by_que() failure on Oracle error : ORA-02396: exceeded maximum idle time, please connect again   (posting from source_db, queue queuename, to target_db) [module opo]
Error    2017-01-23 16:28:12.624320 1114398 1 Poster: 15014 - Poster exit due to trn_cleanup_by_que() failure on Oracle error : ORA-02396: exceeded maximum idle time, please connect again   (posting from source_db, queuequeuename, to target_db) [module opo]
Info     2017-01-23 16:28:12.628507 62914648 1 Poster exited with code=1, pid = 14876732  (posting from source_db, queue queuename, to target_db)

Sometimes the errors can take a different form:

sp_ctrl (alvsupu16:5438)> show log reverse

Info     2017-06-13 19:30:41.026811 10892 1 Poster exited with code=1, pid = 26033  (posting from o.ORA11GR2, queue alvsupu15, to c.ORA11GR2)

Info     2017-06-13 19:30:40.391534 10892 1 Import exited normally, pid = 10901  (importing from alvsupu15)

Error    2017-06-13 19:30:40.379259 26033 1 Poster: 15014 - Poster exit due to trn_cleanup_by_que() failure on Oracle error :   (posting from o.ORA11GR2, queue alvsupu15, to c.ORA11GR2) [module opo]

Error    2017-06-13 19:30:40.377310 26033 1 Poster: 12021 - OCIHandleAlloc failed with ORA--2   (posting from o.ORA11GR2, queue alvsupu15, to c.ORA11GR2) [module osp]

Info     2017-06-13 19:09:29.984926 10892 1 Poster exited normally, pid = 26085  (posting from o.ORA11GR2, queue alvsupu15, to o.ORA11GR2)

Notice   2017-06-13 19:09:29.267941 26085 1 Poster: Deactivation cleaup  (posting from o.ORA11GR2, queue alvsupu15, to o.ORA11GR2) [module opo]

Notice   2017-06-13 19:09:28.262213 26085 1 Poster: Shareplex_Trans table deleting alvsupu15-ORA11GR2 entries due to CleanupTranByQue()  (posting from o.ORA11GR2, queue alvsupu15, to o.ORA11GR2) [module opo]

Notice   2017-06-13 17:39:10.948063 26033 1 Poster: que_delete(alvsupu15+P+o.ORA11GR2-c.ORA11GR2) failed rc=10  (posting from o.ORA11GR2, queue alvsupu15, to c.ORA11GR2) [module opo]

Notice   2017-06-13 17:39:08.923511 26033 1 Poster: Shareplex_Trans table deleting alvsupu15-ORA11GR2 entries due to CleanupTranByQue()  (posting from o.ORA11GR2, queue alvsupu15, to c.ORA11GR2) [module opo]

Info     2017-06-13 17:39:08.885669 26085 1 Poster launched, pid = 26085  (posting from o.ORA11GR2, queue alvsupu15, to o.ORA11GR2)