[Open] Disappearing contacts and relationships of Sims

Product: The Sims Mobile
Platform:Apple iPhone
List the specific devices you play with (e.g. iPhone 6s Plus, Samsung Galaxy S7) iPhone 8 Plus
OS Version 11.2.6
Player ID: (Find your Player ID in Sims Mobile: https://help.ea.com/help/the-sims/the-sims-mobile/find-your-player-id-in-the-sims-mobile ) tamratje
How often does the bug occur? Often (50% - 99%)
Steps: How can we find the bug ourselves? So I was busy with a relationship story (secret crush; more than friends). But now when i click on my sim and go to stories, this story is gone. When I go to all stories it shows how far i got with this story, but it isn’t active anymore. And the sim I was doing this story with, is now nowhere to be found. And most of my contacts are also nowhere to be found (which isn’t the main issue). I tried deleting and re-installing the app, which doesn’t work. Also looked at every place i can to see if I can find it again, but that also didn’t work.
What do you expect to see? To see the sim back and to see that the story is active again.
Connection Type Wifi
Please select your region Europe
Country Netherlands
Additional feedback I hope you will understand me and you can help me with this. Thanks in advance.

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Thanks in advance.

Could it be the Sims that are missing retired and died?

All I get disappearing is the option to ask to move in, it affects those in relationship stories.

But I didn’t know Sims died in Sims Mobile? How does that happen?

All I have is a bunch of elder Sims mooching about town and the numbers are growing.

 I've been having this issue for the past week or so. All of a sudden, most (if not all) of my Sims' contacts disappear, including the stories I've been working on with them. They aren't just retiring and dying, because those sims still show up in my contacts list, but all active sims are just gone, like they were never added and I never started a story with them. 

Product: The Sims Mobile
Platform: Android Phone
List the specific devices you play with (e.g. iPhone 6s Plus, Samsung Galaxy S7) Samsung Galaxy Note8 
OS Version 8.0.0

Player ID: 1002985673489

Location: United States

Just adding to your post. @PaQuilter1 sim and my sim are also in a friendship in my game. Their sports relationship is fine in my game. PaQuilter1's sim shows up in my contacts, in stories etc. 

I did notice that sometimes I page sims to continue the relationship and they don't show up. I figured out they get stuck on the left side of the hospital with other sims there too. I had my sim travel to the medical center, click on the sim to continue relationship and bring them back to my sim house. 

When I have added contacts not all stick. I don't know if it is because I have reached my cap on how many contacts I can have. I do know when I have to many contacts , scrolling through them is very sluggish 

@PaQuilter1 just an update. Van completed the sports friendship with Tyler.  Is Van still not showing up for you in your game? 

@Fuzzernutter No, he totally disappeared from my game. I looked all over town too. He's not here, Fuzz. 😖

@PaQuilter1 That is so odd. Allot of people having issues with adding contacts. I have this issue too with contacts but so far my friendships have not disappeared . I hope EA can help you find a fix. SimFanatic is having a party in a few hours. If you send in Tyler, I can send in Van. Have tyler talk to van and see if their friendship reappears on your end. Just let me know and I'll send Van to the party