unbearably slow wifi AND bluetooth issues on Mojave (HELP)

I need a tip because I bought a wifi+bt card, chipset Broadcom: BCM943602CS

At first it worked flawlessly, or looked like it. A week later the card is slow to the point It takes 5 minutes to load web pages. Bluetooth sometimes gets laggy/disconnects (so the whole card is involved)

I didn't add any kext since the card worked immediately w/o any tweak. But now I'm having second thoughts.

Am I missing something? What could be the issue?

submitted by /u/Eleonorarossi1
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