Welcome to the Community Forum and thanks for your post. I'm sorry to hear that you are experiencing a problem with calls cutting out, causing you to lose parts of the conversation. Has this been resolved for you since your post?
If you are still having a problem with this, I would recommend visiting our following site via the online Help & Support pages: Phone Fix
This is an online guide that's easy to go through and find out if the problem you are experiencing requires the handset to be sent off for repair or if it's something that can easily be resolved.