The mobile phone suddenly sent Netease verification code

That is, someone logs in with your Netease cloud account, so you need your personal authentication here. Because the system may be to detect whether you are using my account, it is very likely that someone else is logging in to your Netease at this time.

Someone may want to register an account, but they mistyped your mobile phone number. And click to get the verification code many times, and your mobile phone doesn't respond, so there will be multiple verification codes. However, if you don't give up texting for a long time, someone may use the verification code vulnerability to maliciously harass. But it does not rule out server errors, pseudo base station fraud and so on.