I've had nothing but trouble with my Surface Pro Marvell network cards since I purchased them. Every few Windows updates, my network cards will disappear and Microsoft support gets them working again. Now my SP is not under warranty so Microsoft wants money to fix their problems. I was able to get WiFi working but the Bluetooth device says the driver is corrupted and I can't find one on Microsoft's site that will load on my SP. Does anyone know where I can get it?