APM 2.8 IMU acting strange

I’m trying to get APM 2.8 working but having some hard times to get bird flying.
First I noticed that Y axis movement are responding slow, X axis working correctly.
Check video here: https://www.youtube.com/watch?v=pLScsTs0ago
When moved copter on Y axis, it takes quite long time when motors are responsing to that.
Then i checked RAW IMU graphs, and this is more than strange.
FC is on the table, with zero movement. X axis graph is nice and stable, but Y axis is bouncing up and down with no reason.
I’ve tried re calibration, even re-installing firmware (both v3.2.1 and 3.2), but result is same.
So now i wonder, is it a hardware issue, or i’m missing some configuration step?