I haven't ever owned an LGB R5, but am not a fan of their points anyway but ...............
Just before the contact strips, there's a lot of flange contact on the plastic - so, as a simple man, I'm tempted to side with the people who have suggested looking at whether the frog is sitting high.
Having said that, riding high on the flange alone should not cause de-railment. My track and points are all pretty scruffy when it comes to the way that they are laid, and all of my stuff, irrespective of the depth of flange, rides through smoothly or bouncily without de-railing.
So .............. id there something else?
Do you have a spare LGB wheelset? Can you just push that through the point and watch what happens?
Then, flick it through a bit faster and watch?
It's the way that I have solved point problems in the past

