diff --git a/packages/system/src/NostrSystem.ts b/packages/system/src/NostrSystem.ts
index 4ecc1e33..c5bb7758 100644
--- a/packages/system/src/NostrSystem.ts
+++ b/packages/system/src/NostrSystem.ts
@@ -118,9 +118,13 @@ export class NostrSystem extends ExternalStore<SystemSnapshot> implements System
     return this.Queries.get(id);
   }
 
-  Query<T extends NoteStore>(type: { new (): T }, req: RequestBuilder): Query {
+  Query<T extends NoteStore>(type: { new(): T }, req: RequestBuilder): Query {
     const existing = this.Queries.get(req.id);
     if (existing) {
+      // if same instance, just return query
+      if (existing.fromInstance === req.instance) {
+        return existing;
+      }
       const filters = !req.options?.skipDiff
         ? req.buildDiff(this.#relayCache, existing.flatFilters)
         : req.build(this.#relayCache);
@@ -137,7 +141,7 @@ export class NostrSystem extends ExternalStore<SystemSnapshot> implements System
       const store = new type();
 
       const filters = req.build(this.#relayCache);
-      const q = new Query(req.id, store, req.options?.leaveOpen);
+      const q = new Query(req.id, req.instance, store, req.options?.leaveOpen);
       this.Queries.set(req.id, q);
       for (const subQ of filters) {
         this.SendQuery(q, subQ);
diff --git a/packages/system/src/Query.ts b/packages/system/src/Query.ts
index f56d7baa..20ce8070 100644
--- a/packages/system/src/Query.ts
+++ b/packages/system/src/Query.ts
@@ -111,6 +111,11 @@ export class Query implements QueryBase {
    */
   id: string;
 
+  /**
+   * RequestBuilder instance
+   */
+  fromInstance: string;
+
   /**
    * Which relays this query has already been executed on
    */
@@ -138,9 +143,10 @@ export class Query implements QueryBase {
 
   #log = debug("Query");
 
-  constructor(id: string, feed: NoteStore, leaveOpen?: boolean) {
+  constructor(id: string, instance: string, feed: NoteStore, leaveOpen?: boolean) {
     this.id = id;
     this.#feed = feed;
+    this.fromInstance = instance;
     this.#leaveOpen = leaveOpen ?? false;
     this.#checkTraces();
   }
diff --git a/packages/system/src/RequestBuilder.ts b/packages/system/src/RequestBuilder.ts
index 129c0816..b93dc648 100644
--- a/packages/system/src/RequestBuilder.ts
+++ b/packages/system/src/RequestBuilder.ts
@@ -5,6 +5,7 @@ import { RelayCache, splitAllByWriteRelays, splitByWriteRelays } from "./GossipM
 import { mergeSimilar } from "./RequestMerger";
 import { FlatReqFilter, expandFilter } from "./RequestExpander";
 import debug from "debug";
+import { v4 as uuid } from "uuid";
 
 /**
  * Which strategy is used when building REQ filters
@@ -50,11 +51,13 @@ export interface RequestBuilderOptions {
  */
 export class RequestBuilder {
   id: string;
+  instance: string;
   #builders: Array<RequestFilterBuilder>;
   #options?: RequestBuilderOptions;
   #log = debug("RequestBuilder");
 
   constructor(id: string) {
+    this.instance = uuid();
     this.id = id;
     this.#builders = [];
   }
diff --git a/packages/system/tests/Query.test.ts b/packages/system/tests/Query.test.ts
index 3c026319..11a7f139 100644
--- a/packages/system/tests/Query.test.ts
+++ b/packages/system/tests/Query.test.ts
@@ -10,7 +10,7 @@ window.crypto.getRandomValues = getRandomValues as any;
 
 describe("query", () => {
   test("progress", () => {
-    const q = new Query("test", new FlatNoteStore());
+    const q = new Query("test", "", new FlatNoteStore());
     const opt = {
       read: true,
       write: true,
@@ -66,7 +66,7 @@ describe("query", () => {
   });
 
   it("should merge all sub-query filters", () => {
-    const q = new Query("test", new FlatNoteStore());
+    const q = new Query("test", "", new FlatNoteStore());
     const c0 = new Connection("wss://test.com", { read: true, write: true });
     q.sendToRelay(c0, {
       filters: [