Advice needed on a Power Adapter

[nuttycomputer]

Hi..
I have a Freeview Box with a external Power Adapter which I plug into the back
Its 5v 1200mA

Its failing as it runs for about 15mins then switches off the Freeview Box, even used a voltmeter on it and it drops from 5v to about 3 ( so it is the Power Adapter and not the Freeview box)
I've used a smaller Power Adapter which is can be set for 3 - 8.4v and this seems to run fine with the Freevew box, now it does state on the this adapter that at 5v its mentions on the label 2.5A and at 6v 2.2A

It seems to run the Freeview box fine, I just need to know will put a strain on the smaller adapter and be a problem or would it cope ok ?

The old adapter looks bigger in size compared to this smaller one..

This new adapter is intended to run quite a good range of electrical devices (Digital Cameras, Keyboards,..etc.etc)

I have enclosed a photo of the OLD Failed adapter ( BLACK 5v 1200mA)

and a photo of my spare Multi Adapter ( SILVER )

Any views would be helpful please...

NEW (SILVER) and OLD ADAPTER (BLACK)
[img]homepage.ntlworld.com/another_world/adapter/adapters1.jpg [/img]

NEW ADAPTER SPECS:
[img]homepage.ntlworld.com/another_world/adapter/adapters2.jpg [/img]

OLD ADAPTER (BLACK) SPECS:
[img]homepage.ntlworld.com/another_world/adapter/adapters3.jpg [/img]

[Guest]

The old adapter max load was 1200ma or 1.2 amp the new one will put out 2.5 amp so it should be more than ok.

[nuttycomputer]