Summoner Skill "Contagion" Issue

Time: 20:20 03/08/2015
Frequency: Quite often
World name: Odin
Character name: Johnny Axecess
NPC name: -
Monster name: Oppressor
Class/Level: Summoner / Level 60
Party or solo: Party
In-game time: 19:20 server time
Area and coordinates: Alexander: Fist of the Father
Steps:
1. After applying my DoT's to the boss I use Contagion as usual. Most of the time it will work however this was the most recent time it did not. Sometimes Contagion simply will not extend my DoT's. It will go on cool down and Garuda will show the animation as if she cast the spell but the DoT's will still have their original timer. I have waited to report this to see if anyone else is experiencing it also but now when it really matters I feel compelled to report it.


Connection Specs
- Type of internet connection/provider: Telekom Germany
- Modem maker/model number: Telekom Germany

PC Specs
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GPU: GeForce GTX 770
CPU: Intel(R) Core(TM) i5-3570 CPU @ 3.40GHz
Memory: 16 GB RAM
Current resolution: 1920 x 1080, 60Hz
Operating System: Microsoft Windows 7 Ultimate

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Browser Information
- Name and version of the browser currently in-use: Google Chrome
- Internet Explorer Version: Internet Explorer 8

Are you sure you aren't just accidentally using it on an add?