I too have had messages disappear on multiple occassions.... or coming through much later than the message was sent.
- a request came in, I responded immediately - accepting and with a written message. My writen message disappeared and has never returned. I had to resend the message.
- a guest of mine messaged stating they had messaged a week previously (they had a question about a preconfirmed trip). I had not received the message - text, app or email. I was unaware they had messaged.
- a guest was parking outside our building but not due to check in until the evening. They messaged upon arrival asking for help with drections... this message did not come through to my phone until 2am... I was asleep and the guest was asleep in our spare room.
AND finally, today... although this time my sent messages kept on disappearing on the app... but somehow they have reappeared. I looked wild as had messaged 4 times with the same information.
I believe it is a failing with the app on occassions??????