Sometime I'm reading the long article, writing long thread on forum or went away from phone for a while. When no activity for around 5 mins, Opera disconnect it self without error and. websites just don't load, gets stuck in loading forever. I must close and open Opera again in order to get connection back. This is so frustrating and it's been happening for months or a year and had never got time to report issue until now.
It doesn't happen on other browsers. Can still have connection while app running for 1 day.