Wifi sync with windows 7

Anyone else having problems with wifi sync with windows 7, I've had technical problems since iOS 5 came out at first I though it was a great option but now I'm pretty disappointed for the following reasons:

1) Various errors come up including could not find iPhone or iPad and disk not recognised, this happens every couple of days, I've made sure my iPad & iPhone are plugged in when that doesn't work I've tried manually setting the devices to sync with iTunes through the settings menus but same problem. Most of the time closing iTunes and opening again does the trick but sometimes a restart is required, this seems really buggy and should have been fixed by apple before they released iOS 5.

2) It seems a bit wasteful to have to have the pc logged in with iTunes open at all times for the wifi sync to work automatically, kind of caught between a rock and a hard place either you have the pc on all the time for it to sync when the devices are plugged in (if it works) or have to turn the pc on and manually force it to sync each time which if I'm using the second option I might as well just plug my iPhone / iPad in.

If anyone else is having the same problems it would be great to hear from you with any advice / solutions to this.