Used this device successfully in many situations where I needed to convert HDMI -> USB-x, 3.0 & 2.0.
No special software needed.
https://www.magewell.com/products/usb-capture-hdmi-gen-2
I have this monitor: 49" Odyssey G9 G95C DQHD 240Hz 1ms(GtG) DisplayHDR 1000 Curved Gaming Monitor | Samsung US
Like having two 16x9 monitors side by side.
Solved the problem, and it was related to IVS - I had both Tripwire & Intrusion set for the same areas. Deleted the Intrusion, and (so far) no more double time during events.
Thx @bigredfish and @steve1225 for the guidence!
Have other cams (one same model) with IVS & SMD, no issues. And no problems with all other cams recording to HDD. Maybe cable? - but would expect to see drops and failures outside of the event recordings.