Following certain Windows updates you may experience problems connecting to WiFi on the Dell Venue 8 Pro and Venue 11 Pro 5130 tablets.
There was an issue with the sequence of two key Microsoft updates which has been corrected. If a customer applied updates KB2887595 and KB2903939 without having previously applied update KB2883200, WiFi would be broken.
To resolve the issue, roll back at least the two problematic updates - KB2887595 and KB2903939 - and then restart and apply all updates. Microsoft has added logic that will ensure the proper updates are applied in the proper order.
If you still encounter WIFI performance issues on your Venue 8 Pro or Venue 11 Pro 5130 tablet, update your tablet to the latest BIOS available. For more information refer to Dell Knowledge Base article Dell BIOS Updates.