Decklink Duo/Quad crash

[Streamia.gr]

System setup:

• Dell G5, i7, Geforce RTX, Windows 10
• Sonnet Thunderbolt PCI Expansion, Echo Express SE IIIe
  
  Echo Express SE IIIe (Thunderbolt to PCIe Card Expansion System) - SONNETTECH

  Compact, desktop 40Gbps Thunderbolt box with 3 PCIe slots and auxiliary power. Supports full-height, half-length PCIe cards. For Thunderbolt 4 and 3 computers.

  www.sonnettech.com
• Decklink Duo (4 sdi inputs) into Sonnet box
• Decklink Quad HDMI Recorder (4 hdmi inputs) into Sonnet box

Problem:

OBS close unexpectedly, either a while after starting or a little later or never in session.
After this it may run for hours with no problem.
Attached related log file. It ends with these lines:

07:59:55.385: User switched to scene 'Camera #1'​

07:59:55.475: decklink: Stopping capture of 'DeckLink Quad HDMI Recorder (2)'...​

07:59:55.478: decklink: Stopping capture of 'DeckLink Quad HDMI Recorder (3)'...​

07:59:55.481: decklink: Stopping capture of 'DeckLink Quad HDMI Recorder (4)'...​

07:59:55.485: decklink: Stopping capture of 'DeckLink Duo (1)'...​

07:59:55.488: decklink: Stopping capture of 'DeckLink Duo (3)'...​

07:59:55.492: decklink: Stopping capture of 'DeckLink Duo (4)'...​

08:00:00.622: decklink: Starting capture...​

08:00:00.629: decklink: Starting capture...​

08:00:00.636: decklink: Starting capture...​

08:00:00.648: decklink: Starting capture...​

08:00:00.664: decklink: Starting capture...​

08:00:00.678: decklink: Starting capture...​

08:00:00.758: device_texture_create (D3D11): Failed to create 2D texture (80070057)​

08:00:29.558: decklink: Starting capture...​

08:00:29.558: decklink: Failed to enable video input​

08:00:30.728: obs_display_init: Failed to create mutex​

Any help would be most appreciated.

Regards,