Be clear and concise when describing the problem. Be specific and remember to include important details, such as the exact error message or address of the site you're having trouble with.
I can confirm the issue when browsing in extreme data saving mode.
One can workaround it by replacing "www.reddit.com" with "old.reddit.com" in URL address but this problem needs a fix by Opera (f.e. through Opera Mini's browser.js implementation) or by Reddit (by redirecting Opera Mini extreme mode users to the "old" version of the website).
That version of Opera Mini is from 2015. Your site works fine for me in Opera Mini 44.1 as iong as data savings is set to high or auto but not with data savings set to extreme.
Old browsers and Opera Mini Extreme mode do not support the full range of modern web design techniques. If you want to support them you need try different themes to find one that works better in those browsers. Or you can try to modify your theme.
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@claudio123 I always use a little android browser called naked browser... only 300Kb, for wifi logins., then open my preferred browser when I know the wifi's working.
It should be reverting to a 'Captive Portal' app, but some of these give similar login problems.