FP2 takes ages to dial/"Call ended" appears with no explanation

Very often, when I try to make a call (including calling up voicemail), it takes a very long time to start ringing after I press “call” - maybe 30 seconds or so. Sometimes, after this long wait, the phone doesn’t ring at all, and just goes straight to “Call ended”.
At the moment I have had a voicemail message since yesterday that I haven’t been able to listen to yet.
What can I do?
Thank you!

Does that happen with and/or without a Bluetooth hands-free equipment?

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