I have recently got the PTCL EVO. For the past few days, I got average 200 KB/s download, which is enough for my requirements. It normally connects at 3.1 mbps (max supported) and green light blinks on the usb device.
However, I noted that after constantly using the internet for 8+ hours, the usb device temperature increases and it becomes hot. The color of blinking light on the usb is now red (instead of green). The download speed also drops from 200/300 KB/s to 20/30 KB/s. And when I try to disconnect the internet and connect again, it gets connected at 153 kbps (screenshot attached).
And if I disconnect the usb device, leave it for 10-15 min and connect again, it will connect at 3.1 Mbps, green light will blink and I get good download speed again.
Is this issue related to the usb device? Is this speed drop linked somehow with the usb device getting hot?