I haven't voluntarily updated any software on my Samsung S5 for well over a year and as stated, all other accessed websites are working fine.
The first screen shot was using the same Samsung internet browser I've used w/o issue for many years and the 2nd & 3rd shots are using the Chrome browser for the 1st time in the past couple of day
Hmmm...and I have been seeing the "blue dot" on the https quite a bit lately. I had to google to find out it alerts you to connection status. I clicked it and didn't see anything major. Next time I will see if I can drill down, maybe get a screenshot.You notice how https is
httpson your display? Might be some kind of certificate / security issue. Maybe you do need that update phone to properly process certificate.