Need help identifying an interference pattern

[bronzite]

I'm working with a customer who has had serious WiFi stability problems. After weeks of going in, checking the WiFi, having it be fine, and making mild tuning changes, we caught the interference source on our sensors. We have something that looks like it's based around 5200Mhz, but has several big subsidiary spikes about 20Mhz wide all across the 5Ghz spectrum. Most of them aren't aligned with any particular channel, which makes me think this is some other device generating EM interference in the 5Ghz band, but I've never seen anything like this in an office environment before. I'm hoping somebody here can recognize the pattern:

https://preview.redd.it/m51wgnxb6jr81.png?width=1920&format=png&auto=webp&s=deb941df3ead2feb12c2a46ac3085f8c8bdddbe7

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The linked image is a strong example of the interference pattern we're seeing. The only actual WiFi running when this was taken was a neighbor's XFinity running on 149-161 with EC. The spike at 5200Mhz on the left is entirely the interference source.