diff --git a/changelog.md b/changelog.md
index b2a902c..edf244b 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,8 +1,4 @@
-### New Features
-
-- 允许切换订阅卡片显示过期时间还是更新时间
-- 添加悬浮窗功能，可以在设置中开启
-
 ### Bug Fixes
 
-- 修复某些 Windows 管理员权限无法正常启动的问题
+- 修复开启轻量模式后 TrafficMonitor 重复启动的问题
+- 修复 TrafficMonitor 重复开关后位置偏移的问题
diff --git a/src/main/resolve/trafficMonitor.ts b/src/main/resolve/trafficMonitor.ts
index 77c121c..21fee11 100644
--- a/src/main/resolve/trafficMonitor.ts
+++ b/src/main/resolve/trafficMonitor.ts
@@ -1,12 +1,24 @@
 import { ChildProcess, spawn } from 'child_process'
 import { getAppConfig } from '../config'
-import { resourcesFilesDir } from '../utils/dirs'
+import { dataDir, resourcesFilesDir } from '../utils/dirs'
 import path from 'path'
+import { existsSync } from 'fs'
+import { readFile, rm, writeFile } from 'fs/promises'
 
 let child: ChildProcess
 
 export async function startMonitor(detached = false): Promise<void> {
   if (process.platform !== 'win32') return
+  if (existsSync(path.join(dataDir(), 'monitor.pid'))) {
+    const pid = parseInt(await readFile(path.join(dataDir(), 'monitor.pid'), 'utf-8'))
+    try {
+      process.kill(pid, 'SIGINT')
+    } catch {
+      // ignore
+    } finally {
+      await rm(path.join(dataDir(), 'monitor.pid'))
+    }
+  }
   await stopMonitor()
   const { showTraffic = true } = await getAppConfig()
   if (!showTraffic) return
@@ -16,6 +28,9 @@ export async function startMonitor(detached = false): Promise<void> {
     stdio: detached ? 'ignore' : undefined
   })
   if (detached) {
+    if (child && child.pid) {
+      await writeFile(path.join(dataDir(), 'monitor.pid'), child.pid.toString())
+    }
     child.unref()
   }
 }