I recommend you first check your website with old Opera 12.16 on your desktop. If you don't see any issues here, please report a bug from Opera Mini and send us a bug ID here (or in chat message).
Trackers are used to track users data down & show ads.
Since Opera becomes a ad publishing company, Opera force users to see annoying ads. User's can't opt out from it.
They may say, Ads are the only way to income. But at least they should give users control over it. While previous version of Opera Mini, any user can turn off ads but while on latest (like version 31) It can't be turned off.
This is happens to me either when I put the phone on airplane mode then turn network services back on or if the phone loses service then it comes back.
Basically I don't downgrade the Android version from now.
This critical problem is not depending on my Tablet environment, it should be improved by Opera mini developer.
By the way "Opera" does never occurs same problem.
I really strange for me, why it has been happening even Opera mini has completely uninstalled and reinstalled.
At the result I have already uninstalled the Opera mini. Then I will never use it anymore.