Originally Posted by DT_

Depending on the production date of your car (it can be found on the drivers door jam sticker or placard on the drivers side of the dash) you may need a TCU programming by the dealer. Ask them to look at SI B84 32 06. This is for a pairing problem not specifically the problem you are having but it would give you the latest firmware in the car so its worth a try but only if your car applies for the update. Please post either the pro date of your car or the last 7 digits of your vin #. Also they can try deleting all devices from the car and clearing any fault memories in the module and then trying again. If the problem then still exists then you need to take it up wth Sprint and see if they have any firmware updates coming up to fix the problem. The screen bug really sounds like a phone issue more than anything but the other things I mentioned are worth a try.
Regards,