Cursor Limitations

Hello! i just used cursor like some weeks ago (i dont know the actual time i start using) and its fine until one day i used Cursor they cannot read multiple files (that are relatively long) and just says message is too long and stuff but it was working before. Is this normal?

Also to add on, What are the benefits of having Cursor Pro? i’m starting to consider. Thanks and please help me decide and answer the questions.