It sounds like the modem that you use (I assume it's the ISP issued modem) has a built-in WiFi. If that's the case, you can leave that modem alone and purchase a DUAL BAND router (dual band guarantees that it has 5 ghz radio) which you set up as an AP or you can buy a "true" AP (eg. Ubiquity UniFi PRO which is expensive BTW). I happen to live in very WiFi infested apartment where all of my devices not just my laptop suffer random ping spikes due to WiFi interference. Like I wrote previously, 5 GHz radio is the solution since it eliminates most of radio interference and it has way more channels available. The disadvantage is just the range is 1/2 of the 2.4 GHz range.
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