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broadcom cards connection problem

New Contributor

My clients (mainly DELL XPS) with Win10 and  Broadcom wifi cards (DellWifi 1560, 1820A) reported random  2-3 times a day rejoins to AP. They was connected to R700 AP with ZD1100 . So we do upgrade to latest ZD1100 . But now they are completly out - they cant connect to EAP 802.1x AES network anymore. Windows drivers was not changed but they cant connect. changing drivers up/down versions doesnt help too.

Clients with XPS but other vendor cards (intel,killer...) are ok.  

On internet there are lot of issues with win10 and broadcom cards, but with previous  ZD fw it worked (with disjoins but worked ).
Is there something specific issues/recommendation for Broadcom cards ?

Thank you for any advice for  specific broadcom tuning my ZD. 

New Contributor
I couldn't find one at the time, though I haven't gone back and checked with newer system software and drivers since as generally we're doing fine without it.