i am noticing 2-3 additional issues with original RCA0231 firmware of K750i

1.Conversation thru loudspeaker is not clear and loud and some background hissing noises disturb.

2.Application hangs(For me twice has happen like this)
Its hangs while playing games when using keys in quick sucession.
When this happens the cell stops responding and freezes even when the switch off phone is pressed.
Then i used cable and start charging
After few mins the phone switches off and white screen comes twice.
When the phone restarts the volume of the phone gets reduced.

Any patches for the above issues or any remedy