The random dropping from an H to a G signal, if it is software related.
That's probably to do with your network, o2.
The biggest problem is the damn Wi-Fi. It is getting so bad if the update does not fix it I am seriously considering returning the phone.
In what respects?
With mobile data enabled and connected to wifi, I lose 5% per hour of standby whereas with it off it's less than 1% per hour.
All I can honestly say is maybe make it faster, which I'm sure they will be doing. As for anything else, I really have no problems with it.
This maybe old school but Juice Defender works extremely well for me, wifi on and on standby I lose about 1% every 2 hours.
Actually I just checked my phone as I was typing this and I've been off charge for 5hrs 33mins and I'm at 98%. I'm at work on wifi and have only used this phone for a few text messages.