International roaming issue Switzerland

Hello,

I have problems with international roaming in Switzerland.
I tried to restart the mobile phone and it does not work.
In the past the roaming was working fine.
The manual network selection finds one network (Swisscom) but when I try to attach, I get an error (no access to network)
The phone is 2G
When Sunrise network is available the roaming works fines but the coverage is very limited.

Thanks