Would anyone have an idea for a solution about a particular minor issue that I experience each time I power on my device?

I always power off my device each night. Whenever I turn the device back on next my device downloads really really slow! Like 1Mb slow where normally it downloads at 50Mb. (50Mbps is what I pay for)

My fix is each time I power up my device I simply select "restart" from power options immediately. After I restart the device it will then download at 50Mb and everything will run normal.

This issue is only on this device. Example being when I run a speed test and this device is running slow, I can run the same speed test on my desktop PC and it will be at normal.

Would anybody have any idea why this happens and also a solution for the device to have the proper download speed upon the initial start up as opposed to a restart?

Thanks!

Edit: The device is connected via ethernet wire.