Help - Drive screen keeps popping up

[dogsbody]

On my z3 I keep getting a white screen with "Drive" in the top left corner popping up and covering the screen. It interrupts all/any apps and there is no way to close it when it appears. It will stay on the screen for about 5 seconds before disappearing again.
I have recently had to do a complete reset of the phone because of other issues and now this is even more frustrating than they were.

[Thommo]

There are conflicting reasons for this from a faulty USB port to an app that's infected from the playstore - Try the below

Performing a system repair using PC Companion will often fix issues - This will factory reset your phone and erase all data so best to backup before you begin

Switch off your phone and unplug from Pc (Hold volume up and power for around 10 seconds)
Start PC Companion and select Support zone then Update my phone/tablet then in Blue Repair my phone/tablet and follow the on screen instructions - When prompted connect your phone still switched off holding volume down or back button - This should start the repair or reformat process

If you are using Windows 8/8.1 or a 64bit operating system then adjust the settings for PC Companion and run in compatibility mode and chose Windows 7 or XP