diff --git a/packages/presentation/src/sound.ts b/packages/presentation/src/sound.ts
index 6aa8ec906f4..b705b86b889 100644
--- a/packages/presentation/src/sound.ts
+++ b/packages/presentation/src/sound.ts
@@ -4,7 +4,12 @@ import { getClient } from '.'
 import notification from '@hcengineering/notification'
 
 const sounds = new Map<Asset, AudioBuffer>()
-const context = new AudioContext()
+let context: AudioContext | undefined
+
+function getAudioContext (): AudioContext {
+  context ??= new AudioContext()
+  return context
+}
 
 export async function isNotificationAllowed (_class?: Ref<Class<Doc>>): Promise<boolean> {
   if (_class === undefined) return false
@@ -24,7 +29,7 @@ export async function prepareSound (key: string): Promise<void> {
     const soundUrl = getMetadata(key as Asset) as string
     const rawAudio = await fetch(soundUrl)
     const rawBuffer = await rawAudio.arrayBuffer()
-    const decodedBuffer = await context.decodeAudioData(rawBuffer)
+    const decodedBuffer = await getAudioContext().decodeAudioData(rawBuffer)
 
     sounds.set(key as Asset, decodedBuffer)
   } catch (err) {
@@ -46,6 +51,10 @@ export async function playSound (soundKey: string, loop = false): Promise<(() =>
   }
 
   try {
+    const context = getAudioContext()
+    if (context.state === 'suspended') {
+      await context.resume()
+    }
     const audio = context.createBufferSource()
     audio.buffer = sound
     audio.loop = loop
diff --git a/plugins/love-resources/src/utils.ts b/plugins/love-resources/src/utils.ts
index 1870183ecb9..fa01526fec7 100644
--- a/plugins/love-resources/src/utils.ts
+++ b/plugins/love-resources/src/utils.ts
@@ -296,6 +296,10 @@ async function checkRecordAvailable (): Promise<void> {
       }, 500)
     } else if (endpoint !== '') {
       const res = await fetch(concatLink(endpoint, '/checkRecordAvailable'))
+      if (!res.ok || !res.headers.get('content-type')?.includes('application/json')) {
+        isRecordingAvailable.set(false)
+        return
+      }
       const result = await res.json()
       isRecordingAvailable.set(result)
     } else {
diff --git a/plugins/notification-resources/src/utils.ts b/plugins/notification-resources/src/utils.ts
index db9b2f71fb4..94bac12cc50 100644
--- a/plugins/notification-resources/src/utils.ts
+++ b/plugins/notification-resources/src/utils.ts
@@ -735,7 +735,7 @@ export function pushAvailable (): boolean {
   return (
     'serviceWorker' in navigator &&
     'PushManager' in window &&
-    publicKey !== undefined &&
+    isValidPushPublicKey(publicKey) &&
     'Notification' in window &&
     Notification.permission !== 'denied'
   )
@@ -748,7 +748,7 @@ export async function subscribePush (): Promise<boolean> {
   }
   const client = getClient()
   const publicKey = getPushPublicKey()
-  if ('serviceWorker' in navigator && 'PushManager' in window && publicKey !== undefined) {
+  if ('serviceWorker' in navigator && 'PushManager' in window && isValidPushPublicKey(publicKey)) {
     try {
       const loc = getCurrentLocation()
       let registration = await navigator.serviceWorker.getRegistration(`/${loc.path[0]}/${loc.path[1]}`)
@@ -763,7 +763,7 @@ export async function subscribePush (): Promise<boolean> {
       if (current == null) {
         const subscription = await registration.pushManager.subscribe({
           userVisibleOnly: true,
-          applicationServerKey: publicKey
+          applicationServerKey: urlBase64ToUint8Array(publicKey)
         })
         await client.createDoc(notification.class.PushSubscription, core.space.Workspace, {
           user: getCurrentAccount().uuid,
@@ -808,6 +808,30 @@ function getPushPublicKey (): string | undefined {
   return publicKey.trim() !== '' ? publicKey : undefined
 }
 
+function isValidPushPublicKey (publicKey: string | undefined): publicKey is string {
+  if (publicKey === undefined || publicKey.trim() === '') return false
+
+  try {
+    const key = urlBase64ToUint8Array(publicKey)
+    return key.length === 65 && key[0] === 4
+  } catch {
+    return false
+  }
+}
+
+function urlBase64ToUint8Array (value: string): Uint8Array<ArrayBuffer> {
+  const padding = '='.repeat((4 - (value.length % 4)) % 4)
+  const base64 = `${value}${padding}`.replace(/-/g, '+').replace(/_/g, '/')
+  const rawData = atob(base64)
+  const outputArray = new Uint8Array(rawData.length)
+
+  for (let i = 0; i < rawData.length; ++i) {
+    outputArray[i] = rawData.charCodeAt(i)
+  }
+
+  return outputArray
+}
+
 async function cleanTag (_id: Ref<Doc>): Promise<void> {
   const client = getClient()
   const notifications = await client.findAll(notification.class.BrowserNotification, {