Problem Fairphone 5 internet connection

It’s one month I have Fairphone and I noted this issue: sometime internet connection seem not working, or very slow. I mean internet page never reload, on I can’t send/receive messages with whatsapp or telegram or email.
Normal calls work.
This happened 2-3 times in a month, to solve this I rebooted the phone and magically internet restart.
I noted that this happens regardless of wifi or sim.

Has this ever happened to anyone?