I am having the same problem and have been for the last 3 days. I've been trouble shooting it myself and I have come up with the following things:
Observations
- It actually first happen to my wife's Galaxy S5 first. Made her phone unusable for 3 hours. I have her take the battery out for 30 minutes, wipe the cache, but the only thing that fixed it was a factory reset. She did use the auto recovery (which may be why she has had the problem happen again).
- I was at work when hers did it, but later that evening when I got home and was going to bed, mine started doing the same thing, I have a Galaxy Note 3.
- Tried the same things, but only a factory reset fixed it.
- The next morning my phone locked up twice to the point, that when I pressed the power button or home button to unlock the phone, nothing. Acted like the phone was turned off. The only thing that fixed it was holding the power button down for 10-15 seconds to restart it.
- After the two lock ups, the phone worked fine the rest of the day. I was connecting to all networks, T-Mobile, WiFi's, and Bluetooth. No problems. When I got home that day, I turned on the WiFi to connect to my home WiFi and almost immediately it started the reboot loop. I pulled the battery, powered on the phone and as soon as the WiFi indicator came on I turned off the WiFi. The phone stopped rebooting.
So I believe, my reboot loop (not sure if yours is the same) is caused by my home WiFi. Weird because it doesn't not do it with other WiFi's (I have used 3 others during this time with no problems). I'm not sure what is going on, but any ideas would be appreciated.
Wade