Name of Internet Service Provider (ISP)
Mediacom

Country of residence
United States (Missouri)

Reference number from your ISP, if you have raised this matter with them
I have contacted them, but no reference number

When does the problem occur (e.g. only during specific times such as in the evenings?)
All day, but particularly bad after 6:00 PM Central Time

Frequency of problem (e.g. every 2 minutes)
Every 45 seconds to a minute

Game content in which the issues occur (e.g. dungeons, trials, certain areas)
Everywhere, particularly bad in dungeons and FATEs

I've been playing since May and have never had an issue with lag. I'm on Diabolos. Terrible rubberbanding in dungeons and horrible lag makes the game nigh unplayable at times. My ISP doesn't seem to keen on helping, so any solution that Square Enix can propose on their end would be great. Thank you!