You should be aware of this, there has been alot recently.
Betfair Developers Program has just posted in the Announcements forum of Developer Program Forum under the title of Network Maintenance – Thursday 26th November – 0800-1000 GMT.
This thread is located at http://forum.bdp.betfair.com/
Here is the message that has just been posted:
Please be aware that we are carrying out network maintenance between 0800-1000 tomorrow morning, Thursday 26th November.
The API will be available during this time but the maintenance may impact connections and require applications to be restarted should they be connected to the device that’s being upgraded.