Unexpected reset after hard move - RC Groups

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Hi all, Ive been struggling to find whats going on with my quad, as it just switches off for no apparent reason when I shake it whilst idle. I noticed that in the betaflight blackbox log viewer I do see green bars on the timeline at the bottom, but not sure what they mean. If I leave on Horizon mode, it happens as soon as I tilt the quad over 50 degrees in any direction, I guess thats normal (but still didnt find how to turn this feature off). But even in Acro mode (with and without Airmode), the quad shuts off as soon as I move it too fast. I thought this might be a power issue due to a loose or badly connected cables and reflowed all solder joints, I even tried reflowing the solder joints of the PCB components, but its still happening.

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