Well the killer card is a network interface card, meaning that with either a wireless or wired connection all data packet have to pass through it, so by trying a wired connection we can narrow down the potential causes.
If a wired connection works without a hitch then it is possibly a problem related to the antennae or something related to it on the card, if it does the same with wired connection as wireless connection then it is possibly a problem somewhere else on the NIC card and will need to be replaced.
All the above is ofc under the condition that you have tried all possible software solutions.
Edit: also if you haven't tried reseating the card itself i advise you do so, it can simply be a bad connection to its port.
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15 R2 Killer wifi disabled
