Kindle trouble connecting to hotspot

[jkingrph]

I have a iphone 15promax and occasionally when away from home try to connect to my kindle paperwhite se via the iphone hotspot. My iphone will often see a lot of other wifi locations around which are inaccessible but not my kindle. I can turn both on and off and finally, sometimes after 45 minutes to an hour it will show and I can connect. Any idea what the problem might be.