I think there's also an XGUI button somewhere to refresh data, but I forget where it is, or do not remember if it still exists.
This used to happen to me all the time
The fact it's happening with any regularity at all indicates your server is having trouble with more than just our products.
Most commonly too many mods exchanging data with clients, slow and or high latency server/connection in combination with lots of mods, etc.