I'm not sure if I should start this new issue since my previous was a bit different, but this time I'm 100 % it happens on vanilla without mods or resource packs.

In my slime farm, I have 3 rails with 4 turns around the corners of a slime chunk, and one of the minecarts suddenly and randomly stops, always in a corner (for now in 3 different corners).

It always takes between 5 or 10 minutes to me to get that error happening.

Also I suspect that in a corner the minecarts might skip it's own track in a corner and end up in another track, but for now I haven't seen that in vanilla yet. But having seen that minecarts also stops without hitting anything in corners, kind of proves also that.

If you need to see my map, please tell me and I'll upload it to mediafire (it's over 100 MB, started in version 1.11 a few days ago, and it's seed it's -2013069384034621868).

Thank you very much for all your attention, and have a nice day