Help Volume problems huawei sonic


My sonic recently decided to stop keyboard touch sounds. I have checked all settings and done factory reset but still the same. Also, navigation voice volume is very low. All volume settings are on and at highest level.

EDIT... Just downloaded app "AUDIO MANAGER" and discovered "system volume" with a range of 0-7 that was somehow set at 4. Without that app I cannot see any standard setting called "system volume". So how did it get set at 4 today begin with. Hopefully GPS voice will now be heard too.