Tinder chats will often disappear because either the user has deleted you from their match queue or you have accidentally deleted them. There is no instance where the chat just randomly deletes. However, it’s more than likely they just unmatched you.
One may also ask, does Unmatching on Tinder delete messages?
When you unmatch someone on Tinder, you are automatically removed from each others’ matches list. Your conversations are also deleted, and they won’t be able to interact with you on the app ever again. There is currently no way to undo this action, so make sure unmatching is what you want.
Similarly one may ask, how do I recover Tinder conversations?
Tinder message recovery is possible with any iCloud account. iPhone Backup Extractor downloads your backups from iCloud, finds your Tinder messages, and recovers them. Even if you un-match someone, you can recover the conversation.