Update, 6:38 pm EST: All clear! Everything's fixed, and Tumblr is back to its usual self. Apologies for the interruption, and thanks again for all your patience.
Update, 3:29pm EST: We're seeing these issues again and are once again investigating a fix.
Update 1:35pm EST: All clear! Normal service has been restored for everyone. High five for patience and understanding.
Some mobile app (iOS and Android) users might be experiencing intermittent connectivity issues. We’ll get it fixed ASAP.