just RBd to the regiments tab, after more seconds than normal waiting I got the message "Regiment operation failed" with text "The action you are attempting has failed. Please try again later." a sort-of UK national speed limit icon (with inverted colours) and the option to press "A" to close.
#failed regiment operation message
spark kernel
I wasn't attempting to do anything. Not seen it before. I have a recording of it if needed. I am a grunt-level member of the Regiment.
hollow quiver
A recording would be helpful. If I took a guess, my first question would be, was a tank coming out of battle as you did this? Trying to navigate UI while its trying to load the battles results tends to cause errors similar to this.