I do not do Incomplete Operating System Devices (IOS) but I have some knowledge of Wi-Fi issues.
One option when connecting (This is an ADVANCED) option is to automatically get i/P address and DNS from Host. or to set Static IP and DNS.
I do it both ways depending.... Now my story.....
Years ago where I am just now they put in a Wi-Fi router. A linksys, the took it out of the box and I do not recall if they changed the SSID or just plugged it in and turned it on (I know they did NOT change the Default admin sign in).
Well I'd get to the Dome long about 7 to 7:30, Connect and have good Wi-Fi. Others showing up around say 8:30-9am. NO JOY
I'd hook 'em up Manual (Static) and show 'em how to Reset when to automatic and all were happy.
I finally fed the router the default admin log in and found it only assigned 50 Addresses.. They it was all out.. Changed it to 100 and more were happy.
We got a new manager and I helped him change the password.. I do not know what the new one was so I could no longer get in to the admin functions.
Don't know why it took me as long as it did to figure out they never changed the password.. and no I won't tell you what it is.
But she may have her device set to Static IP and if it convilcts to another device.. That could cuase it to get booted out.
And then there are a host of other causes.. Above my pay grade I fear.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times