diff --git a/build/bin/wis-free-v3.exe b/build/bin/wis-free-v3.exe
deleted file mode 100644
index 167f6a8..0000000
Binary files a/build/bin/wis-free-v3.exe and /dev/null differ
diff --git a/internal/ui/tray/tray.go b/internal/ui/tray/tray.go
index 55bb8a6..f96f1c3 100644
--- a/internal/ui/tray/tray.go
+++ b/internal/ui/tray/tray.go
@@ -5,6 +5,7 @@ package tray
 import (
 	_ "embed"
 	"os"
+	"runtime"
 	"strings"
 
 	"wis-free-v3/internal/config"
@@ -40,6 +41,12 @@ var statusMenuItem *systray.MenuItem
 // Start initializes and runs the system tray.
 // This function blocks until the tray is terminated.
 func Start(app App) {
+	// Pin this goroutine to one OS thread for the whole lifetime of systray.Run.
+	// getlantern/systray creates the notify icon and runs the Win32 message pump on
+	// whichever thread calls Run; if the goroutine migrates between threads, callbacks
+	// and the tray context menu break until restart (often seen after sleep/resume).
+	runtime.LockOSThread()
+	defer runtime.UnlockOSThread()
 	systray.Run(
 		func() { onReady(app) },
 		onExit,
diff --git a/main.go b/main.go
index 4423d9d..a25dabd 100644
--- a/main.go
+++ b/main.go
@@ -6,6 +6,7 @@ import (
 	"embed"
 	"os"
 	"path/filepath"
+	"runtime"
 	"strconv"
 
 	"wis-free-v3/internal/logger"
@@ -40,6 +41,11 @@ var instanceLock *os.File
 var AppVersion = "dev"
 
 func main() {
+	// systray's package init calls runtime.LockOSThread() on the program's startup
+	// thread. Undo that so the main goroutine is not permanently bound; the tray
+	// goroutine locks itself in tray.Start instead (see internal/ui/tray/tray.go).
+	runtime.UnlockOSThread()
+
 	// Ensure only one instance of the application is running
 	if !acquireInstanceLock() {
 		os.Exit(0)