C6300 AC1750 weak wireless signal. Intermittant

What are you getting with a wired PC connected to the modem?

What wifi devices are you using to speed test with. 

You probbably no see anything near 300Mpbs on 5Ghz. Limitations on wifi hardward on phones and pads and being that this modem model is of an older generation, wifi speeds will be limited. I would presume mabye you see near 100Mpbs est speeds on wifi 5Ghz. 

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lwdou wrote:

Hello

 

My modem/router is not producing the speed that I am paying for w/Cox Internet...300mgps

 

Different speed tester programs have different readings. I have changed the channel on both the 2.4ghz & 5G ghz

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