I have been using E-Ten M600 for more than a year without any major problem. In the last few weeks, I found that the alarming notification function was not working. Then I suddenly lost the speaker function. Though the speakers are set for full volume, I do not hear any ringtone and only vibration I can figure out an incoming call. If I use the headset I can hear audio , play MP3 songs.. Does this look familiar to anyone else? Should I suspect the hardware? Just in case it has anything to do the ROM firmware, I got it upgraded from 214 to 230. But no change in status.