After the last update through MyDrive Connect, the voice guidance on my satnav disappeared. It used to work perfectly and now it no longer works. I even tried to test different voices but none of them worked. Not a single voice can be heard from any of the options. I made sure that the voice guidance is turned on, the volume is even on maximum. I used to have the warning sounds for speed limits, cameras, etc. They all stopped working. Help please?