Contacted HTC now it's fix
I contacted HTC about the ringtone going down after every call. They asked me if it was after the software update . It was after that. This is what he had me do:
hold in the Volume Down key and the power key at the same time for a few seconds. Continue holding the Volume Down until you get to an "HBOOT" screen with 3 android guys at the bottom. Once in there, use the volume keys to go down to "Recovery" option, then press the power button once to select it.
You'll be taken to a screen with a picture of a phone with a "!" icon and a red triangle. Once there please hold the Volume Up key and press the Power key once for just a second, then let go, you will see another menu, go down (using the Volume Keys again) to "Wipe Cache Partition" option and press once the power key to select it. Once it's complete, choose the option to "Reboot System Now" and the phone will start back up. The Cache Wipe is complete.
It worked for me.
Hope it helps