To close the loop on this, reducing my frame rate from 15fps to 8fps on all 17 cameras has cured it. Actually, the whole system runs so much faster, it is amazing.

Thanks, I switched on log to file and will use that. I could scan the logs in the dialog, back to the time it happened and don't see any errors. I'll examine the logs in a day or two to see if there is any additional information there.

Usually at the most inopportune times during play back I'm losing 5-15s or recorded video. I'm not sure where to look next. System: 17 Annke C800 cameras, 13th Gen Intel(R) Core(TM) i9-13900K 3.00 GHz with 32g or RAM and 3 x Seagate Skyhawk ST4000VX013 4 TB Hard Drive - 3.5" Internal - SATA (SA...