Old thread to resolve your problem, clear the yobit cookies, then login, it will send a code to your email, the reason this happened is because of IP change which is not in your range eg. you logged in on another device with different ISP,
Happened to me many times when i go through vpn to access torrent sites which is blocked by my ISP,
as for yobit invest box..... they take ponzi schemes to a new level
some win and most loose, winners are the biggest investors
you could loose 90% of your investment within a minute at anytime with no warning,