S20 Ultra doesn't connect calls first time

[BSB1]

Received S20 Ultra and have noticed that if I call a contact or new number, it disconnects before even a first ring.  I then have to do it again in order to connect with the other number.  Is there a solution to this?

[MI5 Level 94: Supreme]

@BSB1 

There are some problems with voice calls at the moment which are being looked into.

https://community.o2.co.uk/t5/Discussions-and-Feedback/Problems-on-o2-network/m-p/1303336#M113412

[BSB1]

Thanks for the reply but I'm not sure this is connected.  I have problems when contacting landlines and mobiles of any network but only on the first try.  

[JascaDucato]

I'm encountering a similar issue on my S20+ (only tested over WiFi Calling so far). I've also not made it through a single call without it cutting out at some point, which necessitates a call back.