WiFi connection issue ?

So I work from home and answer calls for an answering service company. I get customers complaining that there’s a static sound or calls keeps on breaking up. I’m connected to WiFi . Is that a internet connection issue or should I buy an Ethernet cord and get it wired for a better speed ? Or upgrade to a better... show more So I work from home and answer calls for an answering service company. I get customers complaining that there’s a static sound or calls keeps on breaking up. I’m connected to WiFi . Is that a internet connection issue or should I buy an Ethernet cord and get it wired for a better speed ? Or upgrade to a better computer because mine is an older one.
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