I’m having the same problem. I know that I can use a HDD caddy on the DVD ROM, but I currently use a SSD on that caddy. So there is no space there.
I tried cleaning both SATA connection on the HDD and also the daughter board, and also I cleaned the main board and daughter board connection. But same result, it works for some time and stops working
Has anyone tried strengthening the connector as shown in the YouTube video?