Bluetooth disconnection

There have been multiple reports of this issue, mostly on iOS. Which phone do you have?

Android 

Before going over all the possibilities I would restart your phone then...

• I’m Getting Frequent Bluetooth Connection Alerts on My Garmin Watch | Lily
• Garmin Device Not Receiving Smart Notifications From Phone | Lily
• Lily Owners Manual - Managing Notifications (garmin.com)
• Delete Data and Reset Settings.

If after all of this, there is still no joy, contact Garmin Support via chat or phone call (availability depends on time of day and your country).Especially considering your device is likely under warranty, assuming you bought it as new.

Thanks a lot, I had already checked all of the above mentioned solutions. The thing is when the app is closed on my phone the watch gets disconnected which I hadn't experienced with my other smart watches. And even when the app is open on my cell, it gets disconnected afrer 2 or 3 hours and I need to visit the app for the connection.