I agree with the op, been having my own issues of late tho I am not sure if they are associated with updates.
I noticed yesterday there are banner ads popping up now on the page that appears when I open a new tab, it says 'Speed Dial' in the tab label. Banners promoting the likes of Amazon, AliExpress, eBay and Booking.com
I cannot get rid of them.
Is there any way to remove them, or have a different page when I open a new tab, or is that the price you pay now for using Opera ?