We have fixed the below issue and the new version of the application is now available in AppStore with version 6.2.4
It has been observed that if you are on iOS version 8.4 and then triggered an update of SAP BI app from version 6.1 to 6.2.3 product becomes unstable in some cases . Only workaround at this point of time is to delete & install the application again.
For those who have not yet updated the app to the latest version, we would recommend to remain on older version. We are actively working on a patch to ensure a smooth upgrade & we will keep you updated regarding this.