Transmit / Uplink Problem

Here's a Monday morning update on my situation. The transmit / uplink problem has continued unchanged all weekend, and the State Code Monitor shows it out of commission about as much as it is working. Email only sends and receives sporadically. No change from daytime to night time. Line of sight to the satellite is clear, and the receive signal strength remains strong. I power cycled the modem on Sunday morning, rather than rebooting from the App. That had no impact on performance. The modem AC adapter is plugged into a UPS, with a steady 121-123V output. I tagged my initial post for Amanda, who had helped me last time I had an issue in 2018, but it doesn't appear that she hasn't been active for Tech Support since last year. Hopefully someone else will address my post if that's true.