diff --git a/lib/selectors/keyserver-selectors.js b/lib/selectors/keyserver-selectors.js
--- a/lib/selectors/keyserver-selectors.js
+++ b/lib/selectors/keyserver-selectors.js
@@ -1,5 +1,6 @@
 // @flow
 
+import _memoize from 'lodash/memoize.js';
 import { createSelector } from 'reselect';
 
 import type { PlatformDetails } from '../types/device-types';
@@ -48,12 +49,18 @@
   state: AppState,
 ) => state.keyserverStore.keyserverInfos[ashoatKeyserverID]?.connection;
 
-const lastCommunicatedPlatformDetailsSelector: (
-  state: AppState,
-) => ?PlatformDetails = (state: AppState) =>
-  state.keyserverStore.keyserverInfos[ashoatKeyserverID]
+const baseLastCommunicatedPlatformDetailsSelector: (
+  keyserverID: string,
+) => (state: AppState) => ?PlatformDetails = keyserverID => (state: AppState) =>
+  state.keyserverStore.keyserverInfos[keyserverID]
     ?.lastCommunicatedPlatformDetails;
 
+const lastCommunicatedPlatformDetailsSelector: (
+  keyserverID: string,
+) => (state: AppState) => ?PlatformDetails = _memoize(
+  baseLastCommunicatedPlatformDetailsSelector,
+);
+
 const selectedKeyserversSelector: (
   state: AppState,
 ) => $ReadOnlyArray<SelectedKeyserverInfo> = createSelector(
diff --git a/lib/selectors/server-calls.js b/lib/selectors/server-calls.js
--- a/lib/selectors/server-calls.js
+++ b/lib/selectors/server-calls.js
@@ -1,5 +1,6 @@
 // @flow
 
+import _memoize from 'lodash/memoize.js';
 import { createSelector } from 'reselect';
 
 import {
@@ -26,14 +27,16 @@
   +lastCommunicatedPlatformDetails: ?PlatformDetails,
 };
 
-const serverCallStateSelector: (state: AppState) => ServerCallState =
+const baseServerCallStateSelector: (
+  keyserverID: string,
+) => (state: AppState) => ServerCallState = keyserverID =>
   createSelector(
     cookieSelector,
     urlPrefixSelector,
     sessionIDSelector,
     (state: AppState) => state.currentUserInfo,
     connectionSelector,
-    lastCommunicatedPlatformDetailsSelector,
+    lastCommunicatedPlatformDetailsSelector(keyserverID),
     (
       cookie: ?string,
       urlPrefix: ?string,
@@ -51,4 +54,10 @@
     }),
   );
 
+const serverCallStateSelector: (
+  keyserverID: string,
+) => (state: AppState) => ServerCallState = _memoize(
+  baseServerCallStateSelector,
+);
+
 export { serverCallStateSelector };
diff --git a/lib/utils/action-utils.js b/lib/utils/action-utils.js
--- a/lib/utils/action-utils.js
+++ b/lib/utils/action-utils.js
@@ -12,6 +12,7 @@
   CallServerEndpointOptions,
 } from './call-server-endpoint.js';
 import { getConfig } from './config.js';
+import { ashoatKeyserverID } from './validation-utils.js';
 import { serverCallStateSelector } from '../selectors/server-calls.js';
 import {
   logInActionSources,
@@ -436,7 +437,9 @@
   paramOverride?: ?$Shape<BindServerCallsParams>,
 ): F {
   const dispatch = useDispatch();
-  const serverCallState = useSelector(serverCallStateSelector);
+  const serverCallState = useSelector(
+    serverCallStateSelector(ashoatKeyserverID),
+  );
   return React.useMemo(() => {
     const { urlPrefix, connectionStatus } = serverCallState;
     invariant(
diff --git a/native/socket.react.js b/native/socket.react.js
--- a/native/socket.react.js
+++ b/native/socket.react.js
@@ -21,6 +21,7 @@
   useDispatchActionPromise,
   fetchNewCookieFromNativeCredentials,
 } from 'lib/utils/action-utils.js';
+import { ashoatKeyserverID } from 'lib/utils/validation-utils.js';
 
 import { InputStateContext } from './input/input-state.js';
 import {
@@ -102,7 +103,7 @@
     }, [active, navContext]);
 
     const lastCommunicatedPlatformDetails = useSelector(
-      lastCommunicatedPlatformDetailsSelector,
+      lastCommunicatedPlatformDetailsSelector(ashoatKeyserverID),
     );
 
     const dispatch = useDispatch();
diff --git a/web/socket.react.js b/web/socket.react.js
--- a/web/socket.react.js
+++ b/web/socket.react.js
@@ -17,6 +17,7 @@
   useServerCall,
   useDispatchActionPromise,
 } from 'lib/utils/action-utils.js';
+import { ashoatKeyserverID } from 'lib/utils/validation-utils.js';
 
 import { useSelector } from './redux/redux-utils.js';
 import {
@@ -67,7 +68,7 @@
     const callLogOut = useServerCall(logOut);
 
     const lastCommunicatedPlatformDetails = useSelector(
-      lastCommunicatedPlatformDetailsSelector,
+      lastCommunicatedPlatformDetailsSelector(ashoatKeyserverID),
     );
 
     return (