Ever since the automatic upgrade a few weeks/month ago, my WiFi keeps dropping. I can get it back again by turning it off, going to Airplane mode, turning Wifi back on again, then turning Airplane off again.. .but that only lasts for a few minutes before Wifi drops again. Wifi shows as being high, but it's not and I ended up going over my data usage for this month because I didn't realize I was streaming movies at home when my phone wasn't using Wifi. Any ideas on what to do?