THS hasn’t stop sending notifications. I receive emails when I have a message and I receive App notifications. I haven’t experienced missing a notification.
Have you confirmed that you have enabled message alerts in your account settings? The website only has the option to select email updates re: sit alerts, news and special offers but the app allows you to turn on alerts for messages, applications, and reviews
Oh the irony! There’s another thread on here about sitters’ applications being marked as read but no acknowledgement from the owners, how the sitters find this incredibly rude and how long they wait before withdrawing their application!! I’m a sitter and have been in that position but I think your situation shows an even greater degree of rudeness from the potential sitters. There may of course be a time difference involved for some people but a response should be within 24 hrs I’d have thought. But, lack of a prompt response could indicate that they wouldn’t be good communicators so they’re possibly doing you a favour by inadvertently flagging that now.