I'm curious if anyone else ever has this problem. ..it doesn't happen all the time and I haven't been able to find a cause. Sometimes the time on my phone will be off by at least 30 minutes or so. It's slow, not fast. It doesn't happen when it's charging so it's not that. Saturday i set the phone on the coffee table and picked it up a while later and the time was off. My S3 did that too and my Note 2 does it as well.