After 3 weeks my Lumia 820 will not increase or decrease the volume. It is stuck on level 00. Obviously I'm pressing on the volume button but it does not respond.
The phone itself isn't frozen and I'm able to switch it on/off but I did as you suggested but problem still there. This began yesterday while listening to music I attempted to increase volume but the volume button would only decrease not increase. Now the level is at 00 and will not budge. I think the circuit board or whatever must be faulty.
Problem still there. It is definitely the increase volume side of the button that has developed a fault. I guess I'll have to take the phone back to the store next week.