I have this weird "turn on your laptop and your phone cannot see the wi-fi anymore" bug, or whatever this is. I've tested this with different phones, same issue

I have this weird "turn on your laptop and your phone cannot see the wi-fi anymore" bug, or whatever this is. I've tested this with different phones, same issue. So, I'm turning on my phone wi-fi and it all works well. As soon as I start my laptop, the wi-fi goes off, it is not seen by my phone. The laptop is cable-connected. Sometimes all is fine so this is kinda random. Maybe on cloudy days it works (as remyp says of his ipads), haven't checked.