Netgear AC1750 problems, Help

Dear Netgear Community,

There is a problem with my AC1750. I have had this modem router for about 1-2 years now, I never had any problem with it, until now. Recently I found out that my internet was really slow, at first I thought it was my PC, but when I tried on my other laptop, the results are the same, also slow. I have 50/5 Mbps internet for Time Warner, and today, I was getting about 30 for download, but for upload speed, it is still 5. Awhile back, I usually get 50/5 speed, I'm not sure why this is happening right now. Right now I can confirm that it is either the modem router itself, or it is Time warner cable's problem. 

I have tried resetting it, powering it down with all other electronics thats using the internet and power it back on, and turning it off and on again... Also, when I was running a speed test on Speedtest.net, I can hear buzzing noise coming out of my modem... is that normal? or is that the reason why I am getting slow download speed? Is there a way to fix this? Please help me... Thanks!:smileyvery-happy: