Hi Eddy,
Thank you for your reply.
i have used other servers over the last 2 weeks - Netherlands, Finland, GB, Prague - same disconnection problem. And, just today after having read your message, I tried Frankfurt - same problem.
One thing to note however, the connection is more stable on my laptop.
The mobile device I am using is a Samsung Galaxy S5 - SM-G00F, Android ver. 5.0.
Wonder if problem lies with device?
Perhaps to provide security protection, avast could consider adding a function to disconnect the device from the wifi network once the VPN connection is lost and an alert is sounded to warn the user.
Thanks again.