disappeared

hi, i am having an issue with texts/imessage disappering as soon as i've sent them. Is it an indication that this person has blocked me? The time stamps remain but the sent messages disappear a second after i hit send and they've visible in the message thread. My storage isnt full, imessages...

iPhone 6s Problem I first noticed this problem last night when I went to use Soundhound - it had disappeared from its folder! Then I found that other apps had gone too - many being Sound or Media related e.g. BBC iPlayer, Youtube and Spotify. Chrome has also gone. If I go to the App Store to...