Why Zyxel router switches from vdsl to adsl?

Amira
Amira Posts: 1
edited February 15 in Home Router

Zyxel router vmg3625-t50b. When the power is off for any reason and is back again, the router switches from vdsl to adsl and from higher speed to lower one. What is the cause of this and how to fix it on vdsl and higher speed? Thanks in advance.

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