Concur on using your own router if the included one isn’t working well. There are lots of good options if you don’t need the Attune feature set. The router world is super tough - with all the chipset shortages and manufacturing challenges, everyone in telecom and IT is trying to roll with change.

(I am an employee of Consolidated Communications, but do not directly work in the Fidium part of the company and speak for myself based on personal knowledge. Also, u/s13drfthvn did some testing with his own router and the performance convinced me.)