After the last software update in October, wifi in my house and at work has become very weak on the phone. Nothing has changed at home or work regarding wifi. At home my phone can barely get a signal when in my bedroom and the router is in the next room separated by a wall. I used to have a very strong signal and could even get it outside in my garage. I've tried power cycling, taking out the battery and sim card. I've tried safe mode as well to no avail.