I have temporarily moved to a new university for a research project, and I'm now using their wifi Internet connection. While everything seems to work fine with the Windows 10 laptop, the Skype app on my Android phone keeps "freezing". What I mean is that although I seem to be connected and I can see my contacts, I cannot make nor receive any calls. Even if I turn off the wifi and use the mobile connection on the phone, the situation does not change.

After many attempts, I have found out that if I logoff from the app and I login again using the mobile connection, the app starts working again. At this point I can even restore the wifi connection and everything works for a while. But eventually it freezes again...

The weird thing is that this trick doesn't always work. Sometimes after I logoff from the Skype app I cannot login back even if I'm connected with the mobile data. I keep getting the error message "unable to sign in. Please check your internet connection". Also, if I try to login to my Skype account using Chrome for Android I cannot reach the page and get the message "DNS\_PROBE\_FINISHED\_NXDOMAIN". But everything else seems to work fine and I can browse other websites or use different apps.

I understand that this might be due to some strange settings of my host university. While this is annoying, I can live with that. But what I really would like to understand, though, is why my phone behaves so strangely even when I'm switch off from the university wifi and I'm using my private mobile data connection...