Home internet really slow and no 5g

I was getting really slow speeds and poor performance for about a month but found out they were working on the towers. Ever since then, my phones and home internet have been connecting to band 41, which shows up at Sprint, or connecting to b66a lot more. My speeds have been around 100mbps. Everything has been working so much better. I was at my wits end and ready to cancel service. Seems like they are upgrading towers and while doing so it's causing some headaches. I've noticed when my phone or home internet is on b12, it's pretty slow. B66 and 41 seem to be good. Speeds are also a lot steadier and don't fluctuate like they used to. I hope the service continues to improve. I've never noticed if the router connects to 5g, my phone does. Never have seen a secondary signal show up either. Not sure why but service is so much better now. It would be nice if they could send out a mass text when they are working on towers in an area because I was thinking that the service was just getting worse. It got to the point where nothing was useable.