Random freezes during the game

I am making a simple 2d space shooter game (like in oficial tutorials), objects(planets, scores, enemies) moving from up to down, each of them has collider2D, rigidbody2D and c# script that moves them. To move objects I use transform.translate(), rigidbody isKinematic is set to true. All collider is set to isTrigger.

During the game sometimes appeares huge nasty freezes, about 1-1.5 secs. In profiler there are no any spikes or high ms. I have noticed in Xcode, when freeze happens cpu consumtion falls to 10-20%.

I just don't know where to look. Interesting that freezes occures only 1 or 2 times in game session and not at the same time.