Particles flickering

I have simple particle system, which in PlayMode flicker at random intervals. I tried different tips from the forum: changed Sort Mode and Order in layer, Shape Mod from Random to Burst spread, increased and decreased number of Max particles and in the end none of it helped. And there is no Z-order here either.
But I noticed that if add a hundredth or thousandth of a share to the lifetime, the blinking becomes a little less frequent. I tried adding different numbers after the decimal point in lifetime, but the problem remains.
Has anyone encountered a similar problem?