I ordered a new DS-7608NI-I2/8P.
Did a few more test on the DS-7608NI-K2. I reinstalled NVR 4.0. I know a NI-K2 is not supposed to run NVR 4 but I had had it running for a few months, I re-installed the latest version I could find, V4.21.008 build 190625. No changes.
Other test I did, on two...