For the second time in about a week I have had a mining node become unaccessable.

Location: World Hyperion
Western Thanalan
Coord 24,18
Char Raven Ironheart

I am mining this location for a Class quest. The first couple of time around the node cluster all worked as advertized. The 1 node would appear but I could not click on it to mine it. Other 3 nodes continue to work fine. Tried logging out and back in. No luck. The node in question remains in the same spot.