r6120 -firmware update?

so the last week or so my internet has been pretty terrible. Mainly it seems to drop devices off, i often get messages saying that I'm not connected to the internet, or the wheel just keeps spinning and websites are unresponsive when I push buttons, etc.

I noticed yesterday that I got an email saying my router had a firmware update that I should download.

My router does the updates automatically, so I checked and it had. I'm on 1.0.0.76 now, and that seems to be the latest firmware.

I'm guessing that's what is causing the problems.

I tried to check the date of the firmware update

https://kb.netgear.com/000062573

but I can't even get to that file to view it. it just keeps kicking me back to the main support page.

I'm typing this on my phone's hotspot, and its been eating my data.

my particular router model doesn't seem to be a good candidate for dd-wrt.

Anyone else having this problem, or have ideas on how to solve the connection issue without losing security?

Thanks in advance.