Ballad/Music Issue

ISP: My University. I'm not giving this away in a forum post.
They do not perform throttling or traffic shaping currently.
Type of Internet Connection: Ethernet -- directly to Uni's Network
Internet Connection Speed:
According to speedtest:
To a nearby server: 22Mbps Down 40 Up
To a server in Tokyo: 3Mbps Down 10Mbps Up

Date & Time: March 28th 2012, ~11:00pm EST
Frequency: Once
Character Name: Macha Maudegonne
Race: Keeper of The Moon Miqote
World: Hyperion
Class/Level: BRD [50]
Area and Coordinates: Cutter's Cry -- Chimera
Party or Solo: Party
NPC Name: n/a
Monster Name: Chimera
In-Game Time: unknown
Steps:
1. Play as Bard in Cutter's Cry -- enter battle
2. Try to cast MP Ballad
3. Observe

Specifically, this issue occurred during Chimera fight in Cutter's Cry. At one point, the music for the game stopped playing, but I was still able to play. The music stopped again during Chimera fight, too. This time, however, I attempted to cast Ballad of Magi and though the casting bar was full, it would not follow through with the action. This time when the music stopped, my UI froze. I was not getting feedback from the UI that I was selecting actions, as if I was having latency issues. However, Everyone else was still moving normally, unlike when I have R0'd previously.

After the UI issues, I was unable to move -- I also was not able to take out/sheath my weapon, or cast other abilities. System Message: "You cannot perform this action".

I died since I couldn't move, I revived and attempted to cast Ballad again. Again, I was stuck in the casting animation when the bar filled and unable to perform actions, though I was able to move my character.

I reset the client, and the issue went away, though the game music was still stopping in the middle of battle in Cutter's cry.