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You won't get any support from Intel here since the WiFi card is not preinstalled by OEM. Also the 7260 series are meant for 4th Gen Haswell Chipset so if the WiFi card isn't acting properly on your laptop, it's not Intel's fault since they designed and tested that card for their Haswell reference platform only.
Maybe something in the mini PCIe configuration of your laptop that results to losing functionality with your 7260. Well, you can try Microsoft's driver version and see if fixes it.