Bio II being inexplicably interrupted

[Itseotle]

Time: June 8th, Approximately 10:30 PM EST
Frequency: Sometimes
World name: Diabolos
Character name: Itseotle Irracido
NPC name:
Monster name: Dalamud Spawn
Class/Level: Scholar Lv.50
Party or solo: Full-Party
In-game time: Unknown
Area and coordinates: The Second Coil of Bahamut Turn 4
Steps:
1. Was in battle and when the Dalamud Spawn enemies would appear, I would sometimes not be able to cast the spell "Bio II" on them. The spell would begin casting, then immediately interrupt its cast for no reason. I was not being attacked, was in range of the target, facing the target, had sufficient MP, and was not under any detrimental status effects. The spell interruption made the same animation as a spell that was interrupted because the target went out of sight. Spamming the spell Bio II from different angles and ranges would not let it cast, even from "melee range". Even using the ability "Swiftcast" in conjunction with Bio II would still cause it to self interrupt. This would not happen every time the battle was attempted, but if the bug was present it would persist until the battle was reset.

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- Type of internet connection/provider: Cox Communications, Cable Internet 5Mbit/s
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[Culfinrandir]

Did you get a warning message? I can't recall the message I got but I know that the one and only time I did Coil I had one person who couldn't have any protective/healing spells cast on them. It was as if they were behind a barrier in a boss fight and I was outside.

I think we solved it by me completely running out of the sight, not just line-of-sight, of the other players and when I was back it was all good.

In short, sometimes in Coil things can become unresponsive to any magic abilities for no apparent reason.