@Tony Tony, that was a great solution. It is exactly what I did with my Dell Latitude E6540 with the Intel AC 7260. I don't think upgrading the card is a possibility so changing the mode to...

@Consolamentum One other solution is to go to advanced/setting/wireless settings/ and in the 2.4 channel change the mode to 802.11b/g/n mixed for older Dell laptops. I can verify this fix works for...