Chrome = battery + ram eater
UC = rich with advertisement
Firefox = heavy
Safari = less featured
Torch = advertisement load
Opera = best android browser <3 [link redacted by Mod]
The system OS maybe crashed during installation of some harsh application. Press up volume + power button while turning on the phone, reset / flash the phone may fix your problem. (Caution: all data inside phone will be deleted)
Lol, UC browser is itself an advertisement machine that will surely hanged your device with bundle of ads and notifications. Use Opera that is best for me.