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If Snapchat is not working properly, there are a number of possible causes. The most common fix is to restart the app, or if that doesn't work, restart your phone. Clearing the app's cache or deleting conversations may also help fix the issue.Whether you use Snapchat to share ephemeral pictures and messages that expire after a short time or rely on it for video chats, it can be frustrating when the service is offline or...