diff --git a/pkg/worker/coordinatorhandlers.go b/pkg/worker/coordinatorhandlers.go
index 7384c8c67..737c7bd98 100644
--- a/pkg/worker/coordinatorhandlers.go
+++ b/pkg/worker/coordinatorhandlers.go
@@ -165,6 +165,7 @@ func (c *coordinator) HandleGameStart(rq api.StartGameRequest[com.Uid], w *Worke
 func (c *coordinator) HandleTerminateSession(rq api.TerminateSessionRequest[com.Uid], w *Worker) {
 	if user := w.router.FindUser(rq.Id); user != nil {
 		w.router.Remove(user)
+		c.log.Debug().Msgf(">>> users: %v", w.router.Users())
 		user.Disconnect()
 	}
 }
@@ -173,6 +174,7 @@ func (c *coordinator) HandleTerminateSession(rq api.TerminateSessionRequest[com.
 func (c *coordinator) HandleQuitGame(rq api.GameQuitRequest[com.Uid], w *Worker) {
 	if user := w.router.FindUser(rq.Id); user != nil {
 		w.router.Remove(user)
+		c.log.Debug().Msgf(">>> users: %v", w.router.Users())
 	}
 }
 
diff --git a/pkg/worker/room/room.go b/pkg/worker/room/room.go
index 519785326..0f111456c 100644
--- a/pkg/worker/room/room.go
+++ b/pkg/worker/room/room.go
@@ -119,7 +119,7 @@ func (r *Router[T]) FindRoom(id string) *Room[T] {
 func (r *Router[T]) Remove(user T) {
 	if left := r.users.RemoveL(user); left == 0 {
 		r.Close()
-		r.SetRoom(nil)
+		r.SetRoom(nil) // !to remove
 	}
 }
 
@@ -130,6 +130,16 @@ func (r *Router[T]) Room() *Room[T]           { r.mu.Lock(); defer r.mu.Unlock()
 func (r *Router[T]) SetRoom(room *Room[T])    { r.mu.Lock(); r.room = room; r.mu.Unlock() }
 func (r *Router[T]) HasRoom() bool            { r.mu.Lock(); defer r.mu.Unlock(); return r.room != nil }
 func (r *Router[T]) Users() SessionManager[T] { return r.users }
+func (r *Router[T]) Reset() {
+	r.mu.Lock()
+	if r.room != nil {
+		r.room.Close()
+		r.room = nil
+	}
+	r.users.ForEach(func(u T) { u.Disconnect() })
+	r.users.Reset()
+	r.mu.Unlock()
+}
 
 type AppSession struct {
 	Uid
diff --git a/pkg/worker/room/room_test.go b/pkg/worker/room/room_test.go
index ed67e48cb..e41004b99 100644
--- a/pkg/worker/room/room_test.go
+++ b/pkg/worker/room/room_test.go
@@ -269,34 +269,6 @@ func BenchmarkRoom(b *testing.B) {
 	}
 }
 
-type tSession struct{}
-
-func (t tSession) SendAudio([]byte, int32) {}
-func (t tSession) SendVideo([]byte, int32) {}
-func (t tSession) SendData([]byte)         {}
-func (t tSession) Disconnect()             {}
-func (t tSession) Id() string              { return "1" }
-
-func TestRouter(t *testing.T) {
-	u := com.NewNetMap[string, *tSession]()
-	router := Router[*tSession]{users: &u}
-
-	var r *Room[*tSession]
-
-	router.SetRoom(&Room[*tSession]{id: "test001"})
-	room := router.FindRoom("test001")
-	if room == nil {
-		t.Errorf("no room, but should be")
-	}
-	router.SetRoom(r)
-	room = router.FindRoom("x")
-	if room != nil {
-		t.Errorf("a room, but should not be")
-	}
-	router.SetRoom(nil)
-	router.Close()
-}
-
 // expand joins a list of file path elements.
 func expand(p ...string) string {
 	ph, _ := filepath.Abs(filepath.FromSlash(filepath.Join(p...)))
diff --git a/pkg/worker/room/router_test.go b/pkg/worker/room/router_test.go
new file mode 100644
index 000000000..f404073c0
--- /dev/null
+++ b/pkg/worker/room/router_test.go
@@ -0,0 +1,74 @@
+package room
+
+import (
+	"testing"
+
+	"github.com/giongto35/cloud-game/v3/pkg/com"
+)
+
+type tSession struct {
+	id        string
+	connected bool
+}
+
+func (t *tSession) SendAudio([]byte, int32) {}
+func (t *tSession) SendVideo([]byte, int32) {}
+func (t *tSession) SendData([]byte)         {}
+func (t *tSession) Connect()                { t.connected = true }
+func (t *tSession) Disconnect()             { t.connected = false }
+func (t *tSession) Id() string              { return t.id }
+
+type lookMap struct {
+	com.NetMap[string, *tSession]
+	prev com.NetMap[string, *tSession] // we could use pointers in the original :3
+}
+
+func (l *lookMap) Reset() {
+	l.prev = com.NewNetMap[string, *tSession]()
+	l.Map.ForEach(func(s *tSession) { l.prev.Add(s) })
+	l.NetMap.Reset()
+}
+
+func TestRouter(t *testing.T) {
+	router := newTestRouter()
+
+	var r *Room[*tSession]
+
+	router.SetRoom(&Room[*tSession]{id: "test001"})
+	room := router.FindRoom("test001")
+	if room == nil {
+		t.Errorf("no room, but should be")
+	}
+	router.SetRoom(r)
+	room = router.FindRoom("x")
+	if room != nil {
+		t.Errorf("a room, but should not be")
+	}
+	router.SetRoom(nil)
+	router.Close()
+}
+
+func TestRouterReset(t *testing.T) {
+	u := lookMap{NetMap: com.NewNetMap[string, *tSession]()}
+	router := Router[*tSession]{users: &u}
+
+	router.AddUser(&tSession{id: "1", connected: true})
+	router.AddUser(&tSession{id: "2", connected: false})
+	router.AddUser(&tSession{id: "3", connected: true})
+
+	router.Reset()
+
+	disconnected := true
+	u.prev.ForEach(func(u *tSession) { disconnected = disconnected && !u.connected })
+	if !disconnected {
+		t.Errorf("not all users were disconnected, but should")
+	}
+	if !router.Users().Empty() {
+		t.Errorf("has users after reset, but should not")
+	}
+}
+
+func newTestRouter() *Router[*tSession] {
+	u := com.NewNetMap[string, *tSession]()
+	return &Router[*tSession]{users: &u}
+}
diff --git a/pkg/worker/worker.go b/pkg/worker/worker.go
index 04e3ae274..6ff68e033 100644
--- a/pkg/worker/worker.go
+++ b/pkg/worker/worker.go
@@ -69,7 +69,7 @@ func New(conf config.WorkerConfig, log *logger.Logger) (*Worker, error) {
 	return worker, nil
 }
 
-func (w *Worker) Reset() { w.router.Close() }
+func (w *Worker) Reset() { w.router.Reset() }
 
 func (w *Worker) Start(done chan struct{}) {
 	for _, s := range w.services {
@@ -77,6 +77,9 @@ func (w *Worker) Start(done chan struct{}) {
 			s.Run()
 		}
 	}
+
+	// !to restore alive worker info when coordinator connection was lost
+
 	go func() {
 		remoteAddr := w.conf.Worker.Network.CoordinatorAddress
 		defer func() {