hello bro...
hikvision recommends a 50 watts power supply. Currently, from what you say, you are giving it 3 amps instead of 5 amps. Why don't you try changing the power supply.
Greetings and waiting for your comments.
HELLO, WHAT TYPE OF CURRENT POWER SUPPLY ARE YOU USING?
I SOLVED THE PROBLEM BY CONNECTING IT TO A 12 VOLT, 5 AMP POWER SUPPLY, AND STILL WORKING FINE.
I HOPE IT IS USEFUL TO YOU.
GREETINGS AND I LOOK FORWARD TO COMMENTS.