z1 and z2 charging problem

[moonmonkey1]

Hi 9 months ago I bought a Sony docking station for my wife's z2 everything worked OK up until last week when her phone only started to charge to 90% whilst on the dock (which is plugged into the wall). When it reaches 90 % the phone flashes red and doesn't reach full charge.

But it does charge full on my z1 dock or via USB. Justice double check I put when z1 onto her dock and the same thing has happened it only charges to 90% and the phone flashes red until you remove it from the dockany ideas?

[Qatrium]

Did you try her Z2 dock with your charger head?

[moonmonkey1]

No because on the z1 is in one piece you can't disconnect the wire

[Qatrium]

Original Sony docks come as 2 pieces, you can disconnect the wire as USB connection. Are you sure you have the original DK31 charging dock made by Sony?

If it's not original that might be the problem.

[moonmonkey1]

It's definitely an original, but it's also the one that is working correctly. It's the one forth z2 which is playing up

[Qatrium]

The Z2 one is original for sure also?