As the title says. Sometimes when playing as Vasari, some or all of my construction frigates will suddenly refuse to keep building a structure. As in, it gets 1% built (or, sometimes, 35%, or more), and then the construction frigate stops "constructing" for a minute or two, and only then keeps building the structure. This has never happened while playing any of the other races. Manually telling the lazy construction frigate to construct the structure, or telling another construction frigate in the gravity well to construct the structure, returns "Target must be an unfinished structure" - it can't be fixed.
This happens to planets even a long time after having been colonized, and even when there are no enemies anywhere near the gravity well.
It doesn't happen all that often, but often enough to be quite annoying, especially when I NEED the structure there as soon as possible.
Anyone else have this problem or have any ideas why it happens?