Hi, this is known issue that is been happening on steemit and other steem apps as well, we are working on it to fix this sudden comment and posts loses... Sorry for your struggles, Are you using latest 1.4.7 version for iOS, what device and iOS version you are on? If you get chance, please report details of issues to Github and we will make sure to work on them. Thank you! https://github.com/esteemapp/esteem/issues