issue with some ppk images causes registration problems- Is there a fix?

[max72]

I have an aerial project where I extracted correct photo position using ppk.
It never failed, but this time a portion of the coordinates are wrong (about 80 of 430).
Disabling position or increasing accuracy fixes the issue (once detected).
But until now I had big issues because using the tight accuracy proposed by the ppk the whole matching went wrong, and the camera parameters were adapted to an impossible profile.
I assumed I would get big errors on the offending pictures, and a slightly wrong result, but in fact I got a terribly wrong result and an uniform error split around all the pictures.
It looks like the position accuracy is taken too seriously? In the corrected position accuracy is about 5-10mm.
Is there a way to help the calculation and detect a similar situation? Maybe relaxing a bit the accuracy?

Thanks in advance,
Massimo