I am having trouble with my Raspberry Pi's Ethernet and USB ports. I was using Ethernet port usually for my experiments with pi. But I tried to connect 4-channel relay board to my pi. According to my knowledge, I tried with 5V at the starting and then when I changed to 3.3 V, VNC viewer started reconnecting and after some time the ethernet connection got shut down or my pi cannot recognize the ethernet port anymore. I want to make my ethernet port working. Can anyone please help me with this problem? I really need a quick solution as I am running out of time. At the moment I don't want to connect the relay but I want the port should work fine. Thank You in advance.