It is unlikely that a system flush would work. However, if you want to try, it cannot hurt. Here is a guide that will help with this:
https://www.2carpros.com/articles/power-steering-fluid-flush
Assuming that does not help, I suspect you are going to have to replace the pump. More then likely what is happening is the pump is weak and when the fluid is cold it cannot push it through the system too easily. Then when it gets warm and the fluid thins out, the pump can move it easier and it starts working.
Here is a guide that will help with the replacement:
https://www.2carpros.com/articles/how-to-replace-a-power-steering-pump
Lastly I attached the process below on how to replace it from the manual.
Let us know what questions you have. Thanks
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Tuesday, December 22nd, 2020 AT 7:12 AM