[andyjh]

It would also be useful if you can tell us which IP you're connecting to when you see the error (eg from dev tools).

[kadang]

I get the PHP error about 9 times out of 10 when accessing https://www.bbc.com and https://bbc.co.uk in both Firefox and Chrome (from Switzerland). IP accessed in both cases (i.e. PHP error and successful page load) is 151.101.12.81:443.