Single device wifi slowdown?

In my home wifi, we have spectrum internet, promised at 200mb/s speeds and through wifi, we don't even hit 60mb/s. When I hook my laptop up to ethernet to th router, I hit the upper 90s, but still not advertised. Now the main problem I am currently having, is that my wifi speed test is really bottoming out at... show more In my home wifi, we have spectrum internet, promised at 200mb/s speeds and through wifi, we don't even hit 60mb/s. When I hook my laptop up to ethernet to th router, I hit the upper 90s, but still not advertised. Now the main problem I am currently having, is that my wifi speed test is really bottoming out at less than 30 recently, and currently getting a fraction of 1mb/s. However, nobody else on my wifi has any problems, the laptop in my brother's room, literally next to mine, is getting 40. I am concerned with a possible wifi card in my computer going bad. What's the explanations for this potentially?
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