Same here, my TTIG-915 (US) has been now down for 6 hours.
Last time this happened, 4 days ago, I messaged Krishna at TTI directly.
He confirmed there was a problem with the “bridge”, then fixed it.
Here’s the post from Krishna regarding previous issues about the bridge.
https://www.thethingsnetwork.org/forum/t/ttig-the-things-indoor-gateway/22049/390