I run CMs+T4s daily. Lately other members of my party and myself, have been running into invisible bosses.
CM100 Arkk seems to be especially bad, but it's happened on other bosses too, such as Mai Trin. Occasionally, the boss will go invisible for some party members (if not all), making it frustrating to killing the boss, depending what fractal you're in. Arkk isn't bad since he doesn't more at all, but bosses like Mai Trin make it frustrating for a melee DPS like myself, and we don't know what causes it. Sometimes a wipe or a /gg will fix it, but it seems real inconsistent as to why it when it happens. My friend who runs an i7-8700k + GTX 1080ti runs into this issue as well. Some others I've done runs with that have lower end systems sporadically have this issue.
I run on a high-end gaming laptop:
16 GB DDR4 @ 2400 MHz
Can you find out what causes This? I'm sure my friend and I aren't the only ones here.