My wife's 4S has a battery problem such that even when the phone is in standby it clocks up usage such that the standby and usage figures are almost the same e.g. it can be fully charged at bedtime and then next morning it will show, say, 7:50 usage 8:00 standby. I have done the obvious - closed apps, restarted it, done a hard reset etc. to no avail. The thing is she had this problem once before a few months ago and at that time I tried everything including restoring it from iTunes both from a backup but also as a brand new phone. This failed to fix it so I booked an Apple Store appointment but just before I went it started behaving itself again. I'm at a bit of a loss what to try this time. Thing is I don't really believe it's a hardware problem. I would swap it with mine (and also swap the sims) to see if the problem moves except that I am running IOS 6 and don't really want to go through through the hassle of working out how to downgrade mine back to IOS 5. Any suggestions please ?