Maybe changing your IP-adress might help?
My phone has a non-static IP address. Most do.
I suggested the IP address, because you said the issue occurs on multiple divices (at the same time?) and resolves itself every 1-2 days.
If all of your devices use the same network (router), they all use the same IP address going out. And dynamic addresses are often changed every 1-2 days...

You could test this theory, by manually changing your IP address in your router settings.