Castrum Meridianum - second (or third?) boss bugged or not?

Hello.

First, excuse me to maybe not use right names ect, usually i play on german client but for lack of ppl talking there i write it here. Also sorry if already posted, i cannot find it.

During the last days when doing CM-runs (not Preatorium), at the second or third boss (Magitek Colossus Rubricatus) sometimes it happens during 50% of his HP that he starts to get "immune" to physical and magical damage. All attacks only do 1 DMG from now on.
Now many ppl always start shouting "Its bugged, lets die and repeat". Most times it helps and the next try the boss can be killed nomally. While it really looks like its bugged because one cannot damage him anymore (besides the 1 DMG per hit) and no matter how long of waiting this doesnt stop, im still not that sure its really a bug.

The last 6 times i encountered this "bug" the boss ALWAYS had a buff on him where it reads like "Decereased damage from all physical and magical attacks". I never saw him having that buff during a fight where this doesnt happen. Also, for example, we continued for 3-5 minutes after he got the buff/bug and just watched what happens while healed the dmg done to us. ALL other debuffs on him weared off of course, only that "reduced damage buff" stays on him.

I add a screenshot here where you can see the symbol on the boss. Im talking about the second buff-symbol on him, just check the pic.

So my question to you is, someone else encountered this too? Is this a bug, is this working as intended? If working, how to get the buff away from him?

https://www.dropbox.com/s/dzo4wrricy...013_042755.jpg

I've had problems with this bug appearing when using Shield Bash as PLD to interrupt his Exhaust move. I'm not 100% sure that is what causes it, but ever since I stopped Shield Bashing him, he never bugged out on me anymore.

This has happened to me exactly once. If you remember how the Death Claws in add groups attach purple lines to the boss, it's these that provide the massive defense buff. Ordinarily, Cid destroys the death claws and this removes the buff. However, there was one time when Cid destroyed the claws, the lines disappeared... but the buff didn't go away! We ended up wiping on purpose to reset the fight and it didn't happen again the next time. Definitely an odd glitch.

My FC came to the conclusion that killing the adds too fast makes Cid's little script bug out and the shield doesn't go away. When we went to single target killing the adds instead of AOE burning we didn't have the issue again. We might be wrong on the cause but we haven't had any issues killing a little slower.

This has also happened to me. At the time we had a person who went AFK during the cutscene after the second boss. We kept clearing and eventually made it to the 3rd boss and they were still in the cutscene so they were obviously AFK and not just RPing or whatever. The boss became "enhanced" but cid was just standing there, and not shooting that big antenna thing with his reaper. We wiped it, and the AFK person dropped group, d/c, or left and we had no problems from that point on.

Another annoying CM bug is when the ID key or whatever it's called that drops from the second boss gets stuck under a rock/debris. All 8 people in the group were unable to pick it up so we had to just dissolve the group because we couldn't progress.

Hopefully they'll fix both of these issues soon.

Thanks for the comments. We also had one person afk-leeching. I will continue to watch this and eventually report it in the bug section.

Thanks

happened to me twice, in both cases there was one guy in cutscene
wiping and repeating it even if there is still someone in cutscene fixes it ...