I used to work on DX220 at the far end from AXE’s. We regularly had these sealed crct problems. It seemed to be simply the method by which the crcts went down, and if someone tried to intervene manually to bring them up. If both ends didn’t co-op, there were problems.
On the DX220 side, we would bring the crct’s up to the nearest to working state we could, then the axe end would block, prepost, post, & deblock. (I’m not an AXE man, so if I got the terminology wrong, don’t shout).