I don't know if this will help but I want to mention it. I had my RT-AX88U 2.4 band set to WPA2/WPA3-Personal and my grand daughter's older iPod would not connect at all (I don't recall the model). I wasn't sure what to do but when I changed this setting to WPA2-Personal it was able to connect. That must just be the tech of that iPod. I know your issue is staying connected but I felt the need to share this experience. I hope you can get it figured out.
Thanks Hulk. Already ran into that with my daughters Lenovo P10.