When I first noticed the hinge pin problem, I thought the springs got weak, truck wouldn't come back up to ride height after drop test. I took the wheels and shocks off, worked the arms through the range of motion, they would not drop with gravity, so I pulled the pins and rolled them on a flat surface
Straightened them out best I could, reinstalled and the arms dropped with gravity.
The thing that surprised me about this problem, I didnt think any of my crashes were bad enough to warrant this issue. Just a couple of half throttle cart wheels.
I landed every full throttle jump rubber side down.
Maybe I just got a batch of really soft pins.
Now the bearing issue was noticed when the left rear wheel looked loose. Total of 4 runs, I replaced those with traxxas rubbers shielded bearings thinking maybe water(melted snow) caused the failure on the metal shield bearings. 8 runs later and the traxxas bearings are giving up. So I ordered rpm knuckles to get the over sized bearings