R6025 Error every hour

Since Sept 27, I have been getting disconnected reliably and constantly every hour (give or take a few minutes). Latency gets steadily worse and worse and memory usage creeps up over time until my CPU is spinning constantly at 95%+ trying to keep up.

I have:

a. submitted an email ticket, to which the response was for first line tech support to copy and paste the "latency troubleshooting guide" into the body of the response email, as if I hadn't read the stickied post.

b. reinstalled FFXIV.

c. repaired Visual C++ redistributable 2008 and 2010.

d. reinstalled Visual C++ redistributable 2008 and 2010.

e. verified that my graphics drivers were up to date, then rolled back to each of the previous 3 versions of drivers to see if there was any difference.

f. confirmed my Windows 10 PC is up to date.

g. Ran nothing other than FFXIV, and still had the same result. This error happens with no other application or combination of apps running on my machine.

As a dev, I can tell you that the cause of the error is dirty code. Something in the client-side programming is trying to execute a method on a destroyed instance. The latency and CPU usage screams memory leak, which is, again, attributable to dirty code. Clean it up and fix your damn game, devs. I'm tired of getting disconnected.

Roughly every hour. Instances (doing dungeons, raids, trials) makes it worse - the game crashes once per run guaranteed, which is bad if I'm tanking.
Hanging out in the open world seems to last 3-4 hours.

Sometimes this:
http://i.imgur.com/Kju9ETu.png

but usually "r6025 Pure Virtual Function Call - " and the rest is truncated.

I am positive it has nothing to do with my machine, or network. To check if it was the router, I plugged directly into the cable modem, and still got the error.