“At the moment there are 0 causes known that can cause your malfunction(s).
Are you still experiencing a malfunction? Then there are external factors causing the malfunction. This is the case in 90% of the malfunctions. Unfortunately, we cannot do anything about this because these are external causes and are therefore not due to our own connection.
Perhaps the question “What can I do if the sound quality of the calls is poor?” between the Frequently Asked Questions can help you further. This question is under the heading Malfunctions.