I have suddenly faced some problems with my S5, and I suspect it may be overheating or a battery issue. Looking for tech advice. 1. Only in the last couple of days, the phone boots up with the incorrect date (0700 on Sunday, 20 April 2014). The warning of this comes entirely from WhatsApp, and the time is corrected within 10 seconds of getting connected to the network. 2. When I try to launch a program, it shuts down before the program has started. Not every time, but about once every 5 or 6 launched. After that happens, pushing the On/Off does nothing, and I have to remove the battery. This is true whether it is plugged in or not. 3. When charging, the phone is very warm to the touch, warmer than before. It charges to 100%, but this is why I also suspect there is a battery issue. 4. The phone behaves more stably if I remove the backing, but that may just be an impression. 5. CPU temperature is higher than normal, in the 56+ range. Before, a high temp would be about 3 to 5 degrees C less. 6. The weather has been terribly hot and the phone lives in an un-air conditioned room. Daytime highs exceed 42 C. What have I done? 1. I allowed the battery to go to zero, then recharged it to 100%. It took a little more than two hours. The result is that I could shut down and restart two times before that Time setting problem happened again. 2. I uninstalled Talkatone, which was persistently starting on startup. No difference. 3. I regularly use Clean Master and Battery Doctor, both of which report no problems and behave exactly the same. Is this enough to go on?