Particle System In UI Flickers

I used a simple particle that rotate a transparent sprite..first that it's loaded(play on awake) all things are right.but when I disable canvas and again enable it(change Ui page)..it starts to flicker.
I put particle amount to 1.and then disable All UI behind it to insure that there is no overlaping.but it still flickers after disabling and reEnabling (so one particle with no UI so there is no z fighting:| )

..setting "order in Layer" in rendering to higher amount than UI elements
..setting render mode to every choice that it offers
..setting canvas Scale and particle scale individually to 1 below 1 or higher amount

..in other tries I destroy completely particle and every time I return to that page create it just after that UI showed,

..changing simuation speed and Size and Scale mode
..all ways lead me to deadEnd.

changing material from blended to alpha blended to anything else
can anyone suggest a way ...

Unity version is 2017.3 p1