Hi hook3m
I've been having problems for the past month with two of my cameras (4MP turrets: Hikvision DS-2CD2085FWD-I ). They both worked fine connected indoors for about 10 days for testing - and then once they were installed outdoors, one worked OK for just 6 hours and then power cycled every 30 seconds or so. After disconnecting and bringing it back indoors and left disconnected for 3 days, it then briefly worked for 3 hours before failing completely (no power up). I have had this unit replaced and installed the new one outside with a new cable (just in case) - and so far it has worked fine for the last 8 hours.
The second camera was installed outside at the same time and worked fine for 5 days and then started power cycling in the same manner. I brought it indoors and it worked fine for 7 days, whereupon I installed it outdoors again with a new RJ45 connector on the cable run to it (in case that was the problem). After just 3 hours it started with the same power cycle problem. So the next day, I installed a brand new cable and then after 5 hours, the bloody thing failed again!
I had assumed that it was cabling problems (and perhaps a faulty first camera) - but now that the second camera has failed in the same manner, I have tried to think of what the hell else it could be, which got me thinking about temperature (it's about 0C / 32F here in England). A quick Google search found your problem at the top of the list.
Did you resolve it - and was it faulty cameras susceptible to a drop in temperature?
I have four other Hikvision cameras all installed outside with no problems (different models).
Thanks.