Route mavlink packets to the cloud via LTE/4G with high loss rate

Hello, I use mavlink-router to route mavlink packets to cloud ecs2 aws (free) via LTE/4G, but the data is transmitted with a very high loss rate, I use raspi 3 mode B+ companion computer. Can someone tell me the problem why the loss rate is so high? I also tried many different baudrates, the results were all the same.