You requested the logs from me. Have you found something helpful?
Not sure if I interpret your log correctly. But it seems you disabled debug logging before the error comes up:
21:16:46.962 T:140286368405696 NOTICE: Disabled debug logging due to GUI setting. Level 0.
21:16:46.963 T:140286368405696 NOTICE: Log level changed to "LOG_LEVEL_NORMAL"
21:17:02.243 T:140283515614976 ERROR: Read - Error( -1, 110, Connection timed out )
21:17:02.245 T:140283515614976 WARNING: underflow: Error reading file - assuming eof
21:18:07.124 T:140283515614976 ERROR: Read - Error( -1, 110, Connection timed out )
21:18:07.124 T:140283515614976 WARNING: underflow: Error reading file - assuming eof
21:19:07.168 T:140283515614976 ERROR: Error on dvdnav_open
21:19:07.168 T:140283515614976 ERROR: CVideoPlayer::OpenInputStream - error opening [smb://*******/*******/VIDEO_TS/VIDEO_TS.IFO]
Not sure where the underflow error comes from. But as it´s a PITA to get a full and unedited log from you, I would like to have those exact files you are using. I won´t inverstigate anything for that kind of issue I can´t reproduce with my own files anymore until we have some samples.