I am sorry to hear that you are experiencing this issue. What do you mean by the screen jolting back and forth? What page does this happen in? And to what page is it jolting back to? What action are you performing before this issue happens? Thank you.
Thank you for reaching out to us through the Community. I am sorry to hear that you are experiencing this issue. I will like to look into this further for you. How are you adding your contacts? Is it by file or manually typing/pasting them in? What browser are you using? Have you tried using a different browser? Do you have any plug-ins enabled? Please provide us more information so that we may try to source out the issue. Thank you!