I dunno if this applies to cataphract as well, but here it is:
As i die, or get too far away from my companion, i literally have to logout and login again or change area in order to be able to use the SR skills again.
The exactly why i dunno, i just know that, after im dead, as i try to “resummon” my companion, it instantly spawn as i was riding, and im not able to dismount nor even use the SR skills, then, after a while, it just “despawn” and again, not able to spawn normally, until i login again.
So yeah, its frustrating…and i dont even die that much