I'm using the iOS app and the web client. When the relay list disappears, this happend in both clients. So I assume this list is managed by Primal instead of using my latest event kind 3 or 10002 content. 

And yes, I'm using other clients as well. 

 If a client deletes your relay list, it will disappear in all other clients. We can investigate to see if it was one of ours; somebody will reach out over DMs.