Slowed down and loose rear tires…

Hey guys, so I was out for a ride a the other night an i wasn’t doing anything abnormal well for me.. I was just going down back roads and such doing about anywhere from 60-90 kmh and as I turned a corner on the home stretch I hit some wash board on the road as I turned a corner and it really shook the atv. at this point I was doing maybe 20kmh. And all of a sudden it felt like an engine brake kicked in and it slowed right down and was feeling really weird BTW I don’t have ADC, I removed it during the winter, I got off and looked all over, checked axles, diffs, drive shafts everything. I thought maybe the belt? But I revved it up and the engine was running normal. I limped it home at about 10kmh because I was less than half a km from my house and started checking it again driving in circles and then it felt weird in the rear end got off and here my right rear tire was crazy loose, it was the upper a-arm bolts wiggled like crazy and the lower ones were very loose too on both sides.
I took it all apart today and from what I can tell I think those plastic bushings need to be replaced which isn’t that big of a deal but do you think that it slowing down like that really fast on me is something else?

BTW I took the belt housing off and it’s mint in there, I was actually surprised haha.

Oh it’s a 2011 850 XP with 2,770 kms

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