There's a few things that could potentially resolve this and 1 I believe you've attempted.
Turn the tv off for a few minutes then back on.
Hard reset the tv but when phoning sky they run it through with you.
Phone Sky for a replacement tv - yes your 3rd!
OR
it could possibly fix with an update.
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Sky Glass 65”
Sky Fibre 500 WiFi Max
Been a sky customer through the ages from before HD boxes were a thing! When sky was a box you had to wind up to work
