Nabble's servers do occasionally have problems and do regularly undergo maintenance operations overnight (overnight in their host country may mean early morning in the UK). For example, have you noticed that digest mail deliveries for this forum almost always appear at close to 09:00. That's a strange time to do a significant maintenance task to a UK audience but, no doubt, will be the middle of the night where the job is done.
You forum is working fine for me here in rural Norfolk, UK, at 11:20 this morning.
Volunteer Helper - but recommending that users move off the platform!
Once the admin for GregHelp now deleted.