Can my iPhone have a delayed response because I blocked someone's number?

Blocked my ex's number about a week ago and ever since, my phone has been slow but only at certain times of the day. I could be in the middle of a call or email and the screen will act like its getting a call but no name/ number appears. I'm thinking maybe he's trying to get on contact with me and that's why it acts up. Has this happened to anyone else?

No It won't I block people all the time on mine and it never dies that

Ofcourse not