I have a IPC-HDW3849H-AS-PV (8MP, Full-color night, 1/2.8” CMOS (3840 × 2160) @20 fps). I also have several IPC-HDW5831R-ZE, IPC-HDW2831T-ZS-S2 , and IPC-HDW4431C-A.
The IPC-HDW3849H-AS-PV disconnects and reboots during the day, I have no issues during the night. It's my only cam that has this...