@Kate3685: Our warranty covers software and hardware defects, but not instances of physical/liquid damage or unauthorised modifications. Did you contact Samsung support in your region to report the issue, and was the watch inspected at an authorised Samsung Service Centre? If so, did you receive a quotation for any out of warranty repairs that might be required to bring the watch back into its warranty specifications?
Regarding your ongoing notification issue, please head to Settings > Notifications > Show Phone Notifications On Watch, to set the conditions for receiving notifications while you're wearing the Watch 4. Also, select Notification Indicator > On to notify you of any unread notifications, and Turn On Screen > On. If the issue persists, head to Settings > Advanced Features, and disable Bedtime Mode and Theatre Mode if they're active, as both options will mute notifications while active.
For the vibration issue, head to Settings > Sounds and vibration > Notification vibration, and choose your preferred pattern from here. You can also explore the additional vibration options for other features while you're here. Let me know how you get on.
