I've had similar problems recently. I live in an area where there's a lot of networks so there's a lot of collision. Most of these networks are running out of the box settings so they're running on 2.4 GHz so make sure you're only using 5.0 GHz. It's impossible to find a channel on 2.4GHz which is empty.
Also wifi scanner only picks up non hidden networks so just because it reports certain channels as empty doesn't mean that no one else is using the channel. So try experimenting with different channels. Also, the distance on 5.0 GHz is shorter than 2.4 GHz so you may need a repeater if you're too far or have too many walls in between the router and your device.
One way to verify that the cause is due to collision is to run speedtest.net on wired connection and look at the graph for download speed. It should be a straight horizontal line. Now if you try it on wireless on a network with a lot of noise, the graph looks very spiky due to collision. Once you find a good channel, it should look similar to the wired connection.
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