For the past week or so, people on the other end of my calls have been saying they hear a lot of echo. Enough to make a conversation impossible. I have tried recalling, them recalling, calling different phones, and none seem to work. I am on 18.18.3 but the problem started before this. I do not hear echo but their voice seems to cut out a lot on my end. My connectivity usually shows "all bars". Anyone else have similar issues or have any troubleshooting ideas? I have a Samsung Galaxy S7. Thanks.