How to parse songs in VK by login and password?

Question

Parsing

Hello. There is a fully working audio parser from VKontakte. Now there are 100 accounts. And I have such a question, when parsing from 1 account, for example, with frequent access by many users, a strange action occurs. That is, for example, if you made 500-700 search requests for audio recordings from 1 account, then it’s as if some kind of block is placed on search by audio from VK, and a page is displayed with the inscription there are no audio recordings, although if you log into your account and enter an artist in the search , start searching, they will be displayed and you can listen to the songs. So my question is what is the problem? Maybe someone in the subject will tell you. And I almost forgot, for example, 5-6 hours pass, the account again starts looking for songs as if nothing had happened.