Thank you for referring to our answers forums. I understand that you are having an issue with your Slingbox 500's power stability. While I can certainly understand how this could be frustrating, this is purely due to the fact that the Slingbox 500 is not supported for use in the UK. The Slingbox 500 is also not compatible with Universal Power Adapters; any power adapters/supplies that are purchased from third-party vendors should not be used with any model of Slingbox.
If you are looking to hook up a Slingbox in the UK, I would recommend purchasing a Slingbox 350 which, can be purchase directly from our online UK store.
Sling Media Forum Moderation Team