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Every time after sleep on windows 7 it took 2-3 minute before it connect back to wireless network. Tried the latest driver (17.1.0) but it make it worse and it crashed the driver, so I needed to roll it back to the previous one. (22.214.171.124). I also disabled the power management feature for this as it suggested in the FAQ.
Operation System: Windows 7 (64bit)
Model: Dell XPS 15
Adapter: AC 7260