@JG5619 The link from @Anonymous is good advice. Let us know how you get on?
Remember Sky Stream is heavily reliant on a good clear internet signal. Are you connected via an Ethernet cable from your router or does it connect via Wi-Fi? I suspect if it is a poor internet connection it will be via Wi-Fi.
If it is, where is your router in relation to your tv and puck? Is it in the same room? If it is make sure your router gets a clear line of sight to your puck with no obstacles in the way as this is essential. Also make sure your router is not near a window such as on a window sill, also not near a mirror, and both the router and puck do not have objects close to them.
A bit of a pain I know but vital to get the best performance out of them.
