If you face any suspicious activity on your Yahoo account then never ignore it as it may cause serious problems to your account to you also so if whenever you face this issue to avail Yahoo Support. You can avail Yahoo Support  by making a call at 1-844-401-3111 at any time as we are always availing for your help.    Our experts try to resolve the issue from the root so that it never affects your account.  https://www.yahoo-customer-service.org