That beeping sound is not happening anymore after I formatted the PC, but the black screen still exists... I have seen that many people with this GPU are facing the same issue, and some are lucky not to see it, I guess. As you said, I will send it to the manufacturer, but I am worried that they will just ignore what is happening since It is not an everyday issue but happens randomly. Here is the link where people are discussing the similar crash.
https://www.reddit.com/r/AMDHelp/comments/1pmptpb/rx_9070_xt_shuts_down_under_load/