I did a second test to determine if SD card recording stops 8-hours after loss of WiFi (Internet). It does not, at least with the current 4.9.4.169 firmware for the V2. WiFi was turned off globally at the router for 12 hours in my test.
My test included 7 V2 cameras, 4 of which remained powered through the loss of WiFi, and 3 that were powered down just before WiFi was restored (just to mix things up). All were functioning properly on WiFi at the beginning of the 12-hour cycle.
All but one recorded the full 12 hours, but that exception was predictable too.
The exception was a cam I had set the plug to power-cycle in the middle of the test. It unsurprisingly did not continue to record to the SD card once power was restored because the WiFi was still down. But it did continue to record to the SD card on its own without intervention about a minute after WiFi was restored, as you would expect.
The continuously-powered cams also reconnected on their own once WiFi was restored. I did not have to power-cycle them.
The 3 cams I powered down just before WiFi restoration predictably lost SD card recording during the few minutes they were off, but nowhere else in the cycle, or after they were powered back up in the presence of WiFi.
So the loss of SD card operation when powering up in the absence of Internet is still the focus here. There is currently no 8-hour bug.