Connection lost in PvP when using gap closers

[LalaSoccer]

So I've gone to support with this issue twice, I've done everything they've said but the issues still persists. First months I did PvP I didn't lose my connection at all, then I started playing classes with gap closers like WAR's Onslaught, DRK's Plunge and MNK's Wind Tackle. This has just happened in Frontlines so far, not in PvE or Feast.

I've tried the following things support has told me to do:
- Under the "General" tab, please delete ALL browser history
- Under the "Security" tab, please move the slider to the lowest possible settings or no higher than "Medium"
- Under the "Privacy" tab, please move the slider to the lowest possible settings or to "Allow All Cookies"
- Under the "Advanced" tab, please make sure that "Allow software to run or install even if signature is invalid" is CHECKED.
- Make sure that all SSL and TLS (EXCEPT SSL 3.0) are CHECKED.
- Changed the compatibility mode to Windows 7
- Opened ports 54992 - 54994, 55006 - 55007 and 55021 - 55040

This didn't work, so I tried contacting support again, but then they said:
"Thank you for contacting SQUARE ENIX Support,

From the information you have provided, we have identified that the account in question is a European account. Unfortunately you have reached the North American SQUARE ENIX Support Center, and we cannot assist with European accounts.

Please contact the European SQUARE ENIX Support Center through this link: http://support.eu.square-enix.com/index.php

Thank you for contacting the SQUARE ENIX Support Center."

Can this be because I play on NA from EU? My programmer friend told me it's a server sync problem, but I've asked around and nobody else seems to have this issue.

Thanks in advance.

Edit: Also tried running the game as administrator on steam. Didn't work.