Jamo A 10 CEN centre speaker speaker jarring

Hello

I have recently (7 months) ago, purchased a Jamo DMR61 with Jamo A102 speaker set + A10 Centre speaker + SUB 200.

My centre speaker is making a jarring noise, sounds something like a loose piece of plastic vibrating. I have interchanged the surround speaker with centre to test and it works fine. This makes me believe that the problem is only with the A10Cen. Since the problem lies with the centre speaker only, here are its specs before I request assistance.

• System: 2 way
• Woofer: 76 mm
• Tweeter: 19mm
• Sensitivity:86
• Power handling long/short term (W) : 60/80
• Frequency range: 150-20.000
• Ohm:6

1. I understand that this unit comes with a 7 yr warranty. Is this problem covered under replaceable warranty?
2. If I was to buy out a new centre speaker which model would you recommend? I don't mind upgrading if the difference in quality is really there.