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@MTB-Idle
TBH it's very difficult to diagnose mechanical issues online especially without a video of this happening. It could be anything including one of your knees making the sound.
You need to either post a video (which will still be tough to diagnose, just a tad easier) or start to narrow things down. Have you tested for any play in the bottom bracket? I would start there and if that is okay we move to the next thing.
Or....just stay in yer saddle :-0