not very happy to say the least, its a extremely annoying bug and the only way i can find a work around is set the ipad autolock to never and turn bluetooth off.
The ipad doesnt lock and the connection doesnt drop. it seems to be an issue on the iphone side of things, because to get the connection back i have to unlock the phone, go into setting, and then personal hotspot. i dont actually have to turn it on or off, i just have go to that setting section and ipad with sync again.
seems to be that something is not being allowed to run once the iphone and ipad autolock while the ipad is using the connection.
like i said before, if i press the home button on the ipad before i leave it, the connection will stay up all night. it only drops once i have a program open that uses the connection and the ipad autolocks.
i used to bag microsoft out for little bugs like this, and here i am on the side of the fence that was supposed to greener wondering if i upgrade my phone and ipad again or wait for windows 8