Slow Home Internet

I'm also experiencing slower speeds and connection dropouts.  My original issue gateway failed about a month ago. It had been in service since April.  My primary and secondary signals are on B66/n71.  The original issued gateway was giving me, on average, a RSRP of -106 dBm primary and -95 dBm secondary and speeds upwards of 60+ Mbps down, 30 Mbps up.  I received an exchange gateway 4 days after talking with a T-Mo tech.  This replacement seems to be defective.  I'm still on the same tower and bands.  The RSRP on the primary is the same, but the signal in the secondary (5G) is weak, -112 dBm.  I've gone through all the setup steps and ended up in the same location with the can turned 90° clockwise from the original setup.  Signal quality and snr are very good on the primary, and marginal on the secondary.  My speeds have dropped significantly. I'm now experiencing signal disconnects that I didn't have before.  I'm also in a rural area, 2.5 miles to the tower, trees obstructing line of sight.