Hello,
I had the same problem with ghost touches on my Volla phone. The support advices me to wash the display. I did and it did not help. They asked me to send it to the service. I did and I spent quite high shipment expenses. I hoped they replace my display. Unfortunately, they returned me the device sauing they washed the display and reflashed the software. I did not believe any of these could fix the problems, so I put the phone into the shelf and do not us it any more. I thought it was because they would like to save the money for display replacement in warranty, but as I read this tread further, they probably even have the replacement parts? Really worth byuing such device.
Regarding the bluetooth, I have quite different problems. It was working like a charm with BQ Aquaris phone with my Volkswagen, but I was not able to pick the phone when using Volla. If I did it on the phobe, the remote party was able to hear me, but I was hearing the ringing in my car still. Even the latest software does it like this.
Very strange.