What are these "numerous checks" that you've done? Is it the TV Speed test via the V6 menus - that's the only test I'd think is going to prove anything here.
Apps are provided by the individual broadcaster, your V6 box just provides the connectivity to it. If Netflix or STV have changed anything, you'd have to ask them - but it's not an update that would need installing in the way it does on a phone or tablet.
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Hi, all apps work fine on my Roku stick, iPads, iPhones it’s only the V6 box they don’t work in. I get a message saying connection issue and time out. The test I have done are the built in tests on the V6 box,, connect to media service, network status, network diagnostics. All test passed The speed test comes back suitable for TV