According to our host:
Your domain was suspended due to heavy MySQL traffic coming from the domain which was resulting in high server loads. I will unsuspend the domain as soon as we resolve the remaining issues on server. I apologize for the inconvenience.
I have already started looking for a Dedicated Server solution for the forum.
I am not sure if the issues (not related to our forum) on the server are completely solved so maybe we will have some more downtime in the next few hours.