I own a 2014 FDii. I had an episode with the CVT overheat, whine, and limp mode at about 50K miles. I had a trans service done and insisted that both filters were changed. The dealership did it, changed both filters and I paid my 300 bucks. Since then I have not had an issue.
As others here have stated, be diligent with fluid and filter changes. There is a "cooler filter" that is a PITA to change, but it's less of a PITA then needing a new transmission.
Also, there was a service note that went out to dealers that noted that an overfill situation is as bad as an underfill situation when it comes to the CVT. So, get the doorman CVT dipstick and chart and when you do your own changes (because it's easy, and waaaaaay cheaper than paying the dealer) fill to the middle of the acceptable range. Not to the top of the acceptable range. This apparently helps keep the fluid from foaming and preserves it's capacity to lubricate and cool the cvt.
Since my first instance of CVT overheat, and having the fluid and filters changed, I put myself on a more strict service schedule and have changed the fluid and filters several times. I have not had another issue with my CVT and I am at 170K miles now.
Another quirk that I have found with the Patriot is that it is very sensitive to spark plug condition. They are cheap. Change them often. I change mine every 6th oil change. (I change my oil every 5K whether the light came on or not). There are mountains of posts about hesitations, jerking or bucking while accelerating, and everyone jumps to transmission problems because of the history. But, almost all of those end up as worn spark plugs.
This forum can be a great resource, and there are a lot of helpful people here.
A CVT will never be my first choice for transmission in a vehicle, but I thought I had to have the FDii and there was no other choice. So, at the end of the day, even if I feel like the vehicle is actually handicapped with the CVT, I still like the vehicle and would buy it again.