WRT1900AC v2 Wireless Download at <1Mbps

I have been using OpenWrt on my WRT1900AC v2 router for several years. Now, regardless of the version flashed, my wireless antenna strength, even when right next to the router, is only 70-80%. Any devices not in the same room as the router are getting <1Mbps download speeds. Is this a sign of the router having hardware issues?

Have you set a country and channel for the wifi?

Yes. Thanks for the reply.

I have abandoned the router and am now using a mesh setup that is much faster for my environment.