WRT1900AC (v1) w/ DD-WRT dropping disconnecting from Internet (Ethernet port that you plug into modem)

Hi, I have an WRT1900AC that I’ve been running DD-WRT off of fine for the past year.

Starting yesterday I started getting dropped every 30-120seconds for a few seconds at a time. I have done trouble shooting and its 100% the router, not my cables, modem or ISP. Also tried different builds of DD-WRT but sadly kong has deleted all the builds for this router.

Now I have had issues in the past with certain ethernet ports dropping the speed down from gbps to 500~kbps.

Would OpenWRT fix this, or should I look into a new router, and if so, what model should I be looking into?

Anyone have insight into this? would using