iPhone 6 ios10 problems

I have had a re-occurring problem since the ios10 upgrade with my iPhone 6 64mb. I am currently at ios10.1.1.

Sometimes my tone sounds work, sometimes it does not. (i.e. no tones, no ringtone-the phone does not ring or text tones, or mail tones, etc.)

I can reset the phone or reboot the phone, and the sound problem goes away for a while (it actually works as it should), but the problem of no sound will eventually come back...

Music does play.

anyone else heard of this or have similar problems?