Not experiencing it, but there are a few things you can try.
Hit shift + esc in Opera ot open its task manager to see what it reveals is using up your ram. Test without extensions too just in case one is triggering the issue.
Make sure Opera's battery saver feature is off. It can cause low-memory warnings if enabled and active (like on a laptop running on battery).
Goto the URL opera://settings/system disable hardware acceleration and restart Opera. Try using Opera like that for a while to see if there's a difference. If so, it might indeed be GPU-related. You can launch Opera with the --disable-gpu command-line switch instead if that's easier.