@mrrory Welcome to the forum.
One of the main reasons for freezing/stuttering is the quality and speed of the Wi-Fi signal being received at the Puck which is not the same as the speed being received at the router. You can check the speed with the Netflix App (Get help > Check network) and is often much less than you might expect. The minimum speeds recommended by Sky are as follows:
HD = 25mbps
UHD = 30mbps
HD + 1 puck = 30mbps
UHD + 1 puck = 35mbps
If your speed at the TV is borderline try connecting via Ethernet cable. If this is not practical you can use powerline adapters (about £30 at Amazon). Note the Ethernet port on the Glass TV (& pucks) only supports 100mbps so don't waste money on the more expensive 1gb powerline adapters
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