I bought a Scott Aspect 980 recently and it was working fine for the first 10km but after that, I had this one problem, where if I pedal really hard (up a mountain or just fast in general, when standing up) from time to time my pedals just kind of snap into place and make a loud noise, it feels like something to do with the chain but I know that bike sounds sometimes behave weirdly. I've been searching all around everywhere for this issue, no luck.
Big point: We went to a service-type cleaning/ fixing place and they did a lot. After that, it seemed all fixed and I was happy, but this problem restarted surprisingly after the bike got really, really dirty (I drove through mud, sand, rain, dirt, everything for around 40mins) my bike had dirt EVERYWHERE, and then the problem came back.
Any ideas? Help would be appreciated!