arfoundation - Problem with galaxy s8 / s10

Hi, I have problems with arfoundation running on galaxy s8 and s10. I'm using Unity 2019.2.6f1 using preview .1, .3 of Version 3. Tried as well version 2.1.4
Using plane tracker (from sampleUXscene) as well as plane tracker + reference point in order to place the object.

Sometimes plane trackers aren't recognized and sometimes they do, (if recognized object behaves for a while but then drifts a lot / moves upwards, sideways).

Strange thing is that same project runs ok-ish (a little drift) on lower end model (s7) as well as as xiaomi mi.

I don't have those mobiles with me, but received messages about it, as well as video (in those cases, plane wasn't even recognized)

Does anyone have some experience in solving this?

Thanks.