I've got a 2013 model and was having the same issues last week. I was losing power on grades in higher RPM range intermittently and the next day the "check fuel filter" light came on. I had assumed it might be the issue anyway, and I have another design on the fuel/water separator that isn't see through, so I had that filter and the fuel filter replaced. Turned out it was the problem. I had a nice sludge build up and water in the fuel that I attribute to some bad batch I picked up at a pilot. Had to change filters twice to get that crap out. Might want to keep an eye on that. I was worried that maybe I was having injector/cup issues as it was only happening under load and at higher RPM, but glad it turned out to just be fuel. Volvos are very peculiar when it comes to fuel.