Can't Access Tumblr With Mobile Data, Only Works on Wi-Fi

I’m unable to access Tumblr using my mobile data and can only log in when connected to Wi-Fi. This issue occurred a few days ago, then resolved itself, but now it’s happening again. I rely on my mobile internet most of the time, and I don’t always have access to Wi-Fi, so this is really inconvenient. I don’t understand why Tumblr won’t work with my mobile connection, and I need this issue fixed as soon as possible. Tumblr, please address this problem quickly and provide a solution. I shouldn’t have to rely on Wi-Fi just to use your app!