Have had my S3 for about a year. No particular problems until recently. At home. Have strong broadband & wifi & a Network extender. About 4 days ago noticed only had 1 bar & battery with more than 50% charge wouldn't make from 10 pm to next morning w/o needing to be charged even though not being used. Coincidence (?) - local store folks say they just activated new tower near my home. Only solution I've found is old app for switching to 3g only.