Everything is back to normal. We are on the latest version - v2.6.1. Thank you for your patience.
If you're interested, have a look at the releases to know what's new: https://github.com/tootsuite/mastodon/releases
And, don't forget to subscribe to our status page for any future alerts: https://exana.io/s/o0a8u6gqz5pz23pg/public