After shutdown the R8000P in bottom power the configurations lose.
Sorry I don't understand that.
What firmware version do you have on the device?
A number is more useful than "the latest". (It may not be by the time people read this.) There can also be newer versions, or "hot fixes", that do not show up if you check for new firmware in the browser interface.
The firmware version is V18.104.22.168_1.2.26.
When I turn off the router lose all configurations.
Please reflash the exact same FW version, then reset the router and configure the device from scratch.
v22.214.171.124_1.2.26 does a lot of funny things, but losing its config on shutdown or restart is not one of them.
~R6400 FW:126.96.36.199 ~Orbi-AC3000 FW:188.8.131.52
~EX3700 FW:184.108.40.206 ~Comcast 1 Gbps/35 Mbps > SB8200 > R8000P