Sims forget already existing relationships

Personal relationships with acquaintances disappear.
When we meet again, we will exchange first-hand greetings.

I used the translation function.

Could you give some more details what you are seeing as there are several issues.

Is this about romantic relationships decaying fast or you having to reintroduce yourself to Sims with rotational play ?

Also any mods and what platform ?

I don't use mods. I build relationships in the game, and when I switch families, and return to them, those Sims no longer have any relationships. 

Like

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Oh my god! Really? This is very difficult, I prefer to wait for you to one day find the mistake and correct it. I give up trying to pass on any error here in this forum. Thanks for the help.

I have the same issue. On PC no mods or CC used.

My sims were in love and then suddenly they forgot they even met and I had to reintroduced them to each other. Then I rebuild the relationship and it happend again while they were on their honeymoon.
And I didn't switch families in the meantime.

There is no specific team to look for bugs in the game, we players needed to keep reporting things here. Everyone is worried about releasing more game packs to get more and more out of us players.

I have had this happen multiple times in my current legacy (currently on 3rd gen., long lifespan.) I hadn't realized it at first as they knew a lot of other sims. What made me notice it was in my second gen. when the dad had completely forgotten their dog who had died; the father had the highest relationship with the dog, but everyone else in the household had remembered the dog when it came back as a ghost. After this I started to notice they were forgetting many sims- their daughters friends who visited often, some of their lower acquaintances, relatives (the grandmother), and even friends. 

Soon after their teenager moved out with her friends, and I have only noticed a couple forgotten sims. But admittedly haven't paid much attention to it as they are busy and don't socialize much. They have forgotten some peers they go to high school with.

At the time I did not have any mods installed, but I have two now. I have all packs except for Journey to Batuu and most of the kits.

Yeah. It’s one of the biggest issues with rotational play IMO. I really wish we could have the option to ‘save’ relationships, i.e. prevent certain relationships from being culled. It would be such a huge QOL upgrade for rotational players.

OMG almost all of my sims have lost all of their relationships with other sims! To the point where they don't even have any other Sims appear in their relationship menu besides those in their household! So many hours of world building COMPLETELY GONE. And I have NEVER used mods or CC so they are not the culprit. Even if I load a previous save from a week ago, my Sims will still lose their relationships after awhile of me playing. I've cheated SOME of those relationships using the ModifyRelationship cheat code, but that was only for SOME of the relationships. PLEASE, PLEASE FIX. This is devastating and ruins the entire game and game play.