It worked fine for around a week or so and in the last couple of days I have been having issues with my wifi network connection.  I got a new Linksys router (EA6300) and it seems like my issues started the following day.  Previously I was using N speed, the new router is dual-band N/AC.

When I have the wifi driver installed it works fine, speed is fast, I can restart the computer, shut down and turn it back on and it will reconnect.  However, the following day when the computer starts it acts as if there's no wifi network driver.  In Device manager, I see the yellow exclamation point on the Boradcom network adapter.  The wired network adapter continues working normally.

I already have the latest Broadcom driver installed.  So I tried uninstalling it, then reinstalling; however, the first time I run the driver install wizard, the computer freezes.  This has happened multiple times the first time I try reinstalling the driver.  After a hard reboot, I have been able to install the driver using the same wizard.  Sometimes this appears to fix the wifi issue and other times I have the same yellow exclamation point and it still is not fixed.

So...any ideas what the issue could be?

I haven't checked for an error code in Device Manager or a Windows Error Log.  I can check for that later today.  I haven't checked wifi adapter settings while it's working but I did see when it's not working, it shows it is in an S3 sleep state.  I have tried the network troubleshooting but it didn't find any solutions.

I reached out to ASRock Tech Support and they said it sounds like a hardware problem.  They said I should RMA just the wifi/Bluetooth card.

I installed the updated BIOS/UEFI version 1.20.  That has not fixed the issue.

I have a SATA drive, not M.2.

Unfortunately, it seems my wifi success has been shortlived.  After a BSOD crash (error 124) and a couple of restarts, the wifi connection has worked once and been inactive a couple of times.

As a matter of interest on a related note, the wifi card on my Dell Latitude D420 exhibits similar behavior in windows, randomly turning itself off and losing signal. Sometimes I am able to repair the connection and other times it simply freezes the system when I try. 

Now here is the interesting part, the Wifi works flawlessly under linux. The beauty of linux is that you can set up a linux USB key that will work in any system and allow you to boot into the OS from a flash drive. I would recommend that you give this a try, to create a bootable linux key you will need:

1. A USB flash drive ~2gb

2. http://www.linuxliveusb.com/" rel="nofollow - Linux Live USB Creator  

3. A linux ISO, I would recommend Ubuntu as it is well supported

Run the usb creator, select your flash drive, direct LiLi to your linux ISO, set the size of your permanence to 500mb or more then just click the lightning bolt. Once complete you can boot from the flash drive into a fully fledged linux installation. If necessary install the drivers for your Wifi and check to see if the problem is present in linux. 

I suspect the issue may be driver related given that I have seen similar problems from several users across platforms and models. All used ITX boards or Wifi versions of desktop boards and I suspect the common denominator is the wifi card itself. If linux keeps your connection stable and there are no errors we should be able to determine where the problem lies with certainty. 

I would like for ASRock to figure out a solution to get this working.  It would be nice to hear from ASRock to see whether they have investigated the issue.

I do have another computer with a mini-PCIe slot (already used for N speed wifi) so if I get around to it I can plug the Broadcom card in there to see if it works.  It's a Zotac motherboard (H55-ITX wifi).

Jon, I also just ordered the The Intel® Dual Band Wireless-AC 7260 802.11ac, dual band, 2x2 Wi-Fi + Bluetooth adapter from NewEgg and will cross my fingers this will solve the simular issues to what you were haivng before.  It would be nice to be able to turn off or reboot the computer without having to worry will my wifi card work or keyboard respond? Who knows. I really do hope AsRock comes up with a solution to this commonly known problems people have been addressing on the forums. Thanks I appreciate any help I can get.

Hey dude, I have the same exact motherboard as you that I used in building my rig I just completed.  I am having the same issues where the wifi card is no longer showing in device manager and even after reseating my wifi network card I still have the same issues, I thought it may of been a poor antenna connection but that wasn't the case.  I am kind of stumped right now far as resolving this issue, I ordered a   http://www.newegg.com/Product/Product.aspx?Item=N82E16833106240" rel="nofollow - Intel Network 7260.HMWWB.R WiFi WIRELESS-AC 7260 H/T 2X2 AC 867 Mbps+ Bluetooth HMC Dual Band  to replace my current wifi network card that came with the motherboard. Does anybody know is Asrock as addressed a resolution to the known issue?

With 4 different bluetooth headsets it cuts the sound. Every minute it cuts the sound for 5 second or so. It should not be the interference as other BT ma machines work ok. And those are turned off while using the machine. 

Proximity does not either seem to have any effect on the sound droppage. If the receiver is 2 centimerters from the card or in other room sound drops at same rate. 

I have the included external antenna attached, is BT using the antenna or is re broadcaster just on the card  itself?  

Using Windows 8.1