TS3992 icloud phone backup failing because wifi disconnects automatically when locked

I'm trying to use icloud backup for the first time. I have 15GB storage available and my backup is going to be a little over 5GB.
Every time I start the backup, it fails because it says I am not connected to wifi. I do have a very good wifi signal and I am plugged in, the problem is that when the phone is locked, the wifi automatically disconnects.
What can I do?
Thanks

Replace your router the issue is your router isn't maintaining connectivity

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