DVR recording was aborted

Using WinTV-quadHD tuner, with 3 of the tuners being used, recording with the 4th tuner fails.
Using Version 1.9.4.4325
Is there another log with more data I’m overlooking? The PMS log shows this:

Oct 15, 2017 19:00:00.693 [3856] DEBUG - DVR:Grabber: Starting operation for ‘60 Minutes - E4 - Episode 4’.
Oct 15, 2017 19:00:00.694 [3856] DEBUG - Activity: registered new activity 1ccf295c-7309-42ae-9931-3509f0fc5b62 - Recording
Oct 15, 2017 19:00:00.694 [3856] DEBUG - DVR:Grabber: Remote starting a media grab on device device://tv.plex.grabbers.tunerservice/dvb%23bda%23pci%23ven_14f1%26dev_8880%26subsys_6a180070%26rev_04%236%267ed88f1%260%2600080008%23 (Hauppauge WinTV-quadHD, supported) tuner 1.
Oct 15, 2017 19:00:00.695 [3856] DEBUG - DVR:Subscription: Resolved subscription to library item ‘60 Minutes’ (101373)
Oct 15, 2017 19:00:00.696 [3856] DEBUG - There were 1 top-level paths for 60 Minutes.
Oct 15, 2017 19:00:00.696 [3856] DEBUG - DVR:Grabber: Saving recording to E:\TV.grab\6f6e38ee3032ede1d2d31d5abb3cfdb18100d50c
Oct 15, 2017 19:00:00.698 [3856] DEBUG - DVR:Grabber: Going to record for 3600 seconds, final URL is http://127.0.0.1:32600/devices/compound_device074dvb%23bda%23pci%23ven_14f1%26dev_8880%26subsys_6a180070%26rev_04%236%267ed88f1%260%2600080008%23/media/triplet%3A%2F%2F0%3A3127%3A1?param=<%3Fxml%20version%3D"1.0"%20encoding%3D"UTF-8"%3F> <tunedata><tt>8<%2Ftt><dq>0<%2Fdq><dr%2F><fr>39<%2Ffr><md>0<%2Fmd><sr>0<%2Fsr><pl>0<%2Fpl><lf>0<%2Flf><l1>0<%2Fl1><l2>0<%2Fl2><ls>0<%2Fls><pp>0<%2Fpp><hz>0<%2Fhz><in>0<%2Fin><fc>0<%2Ffc><t>3127<%2Ft><n>0<%2Fn><s>1<%2Fs><en>0<%2Fen><%2Ftunedata>
Oct 15, 2017 19:00:00.698 [3856] DEBUG - DVR:Grabber: Setting timer to stop grab of ‘60 Minutes - E4 - Episode 4’ in 3600 seconds.
Oct 15, 2017 19:00:00.699 [3856] DEBUG - DVR:Grabber: Waiting for a tuner (1 available).
Oct 15, 2017 19:00:00.699 [3856] DEBUG - DVR:Grabber: Allocated a tuner (0 left)
Oct 15, 2017 19:00:00.699 [3856] ERROR - DVR:Recorder: Error 3 (The recording was aborted) starting the record, shutting things down.
Oct 15, 2017 19:00:00.699 [3856] DEBUG - DVR:Grabber: Freed a tuner (now 1 available)
Oct 15, 2017 19:00:00.699 [3856] ERROR - DVR:Recorder: Error 3 (The recording was aborted) starting the record, shutting things down.
Oct 15, 2017 19:00:00.699 [3856] DEBUG - DVR:Grabber: Operation for 60 Minutes - E4 - Episode 4 completed with status error (The recording was aborted)
Oct 15, 2017 19:00:00.699 [3856] DEBUG - Activity: Ended activity 1ccf295c-7309-42ae-9931-3509f0fc5b62.
Oct 15, 2017 19:00:00.699 [3856] ERROR - DVR:Grabber: Starting media grab failed.