mifi m2000 speed issues

I've just received my MiFi hotspot a couple days ago. Out of the box I was getting 200-300 mbps. It seems to last for 25 minutes then slowed back down to 20-30mbps. I could reboot it and it would go back to 200-300 mbps but eventually go back to 20-30. I have 3 towers near me. 2 of them are 5G and one is 4G LTE. I am riiiiight on the edge of the range of the 5G towers. I am assuming it is just switching over to the 4G tower. A couple questions:

1. Anyway to lock towers or bands with m2000?
2. Anyway to boost 5G signal?
3. Any other suggestions?