Looking at your match history, going back 10 games, I see this one. You won that game. I don't see anyone on your team who looks remotely like a troll (though the Sona should probably have built a Sightstone. Or, y'know, any wards at all.). Judging by levels, no one seems to've afk'd, and everyone had a positive kda.
The next one, you won again. Again, everyone had positive kda, similar levels, and viable builds.
After that, you have this game, which is your first loss in the last 10 games. Here's what I note: the builds seem generally fine, and most of your team is more-or-less positive. You, however, are tied for lowest level, have the least fight-participation (excepting your top Jayce, but that's no surprise), and the most deaths on your team. So, no trolls, no afks, and only one feeder - you. Although, it certainly doesn't seem like that was intentional.
Next, another Xin game. Another loss. Positive kda for you this time. Looks like a rough game across the board, with an overzealous Talon and DC'd Cait. Still, I don't really see any trolls or intentional feeders. AFK sucks, though.
In this game, there's a lot of deaths, but it looks like everyone's pretty close to the same levels. I see nothing wrong with the builds or champs, and nothing I'd note as feeding in particular.
Your next game was also rough, with little grouping and a fair amount of deaths, mostly located on Diana and Wukong. Still, Diana's first 2 deaths were 10 minutes apart, indicating at least an attempt to not feed. It looks like she got frustrated and started making some poor decisions as the game went on. Same for Wukong. Doesn't look like anyone was trolling, nor that anyone afk'd.
You won the next one, supporting as Leona. It looks like a great game across the board for your team, with good builds (except for my personal distaste for AP Amumu), good levels (so not likely to have afks) and no feeding at all.
Your Sion game looks rough. No real feeders, but a lot of poor stats. Like the one with Diana and Wukong, it looks like a lot of outplay. In fact, it looks like a lot of snowball. Still, builds and levels look okay. Very unfortunate, overall.
I was all set to comment on your 12 deaths in the next game, but holy crap. That's just a lot of dying all over the place. Builds look good (though Lee could have used more defenses, imo), levels look fine, kdas are... rough across the board. Only one player had less than 10 deaths, and that was the enemy Ziggs. Still, looking at them all together, no one stands out as being abnormally high. In fact, your team was handily winning until the last couple teamfights at 45 and 47 minutes. Tough break.
I'm seeing, again, a lot of rough play in the last game. I grant it's possible Kha was trying to feed, but I don't think so. He probably needed to just stop trying to gank mid. His early deaths to Kat snowballed her into tearing up Morgana, which led to more deaths for him when he came back to try and shut Kat down. It just looks like a really nasty cycle that, unfortunately, you weren't really in a position to do anything about.
(hit the character limit, will summarize in next post)