See this topic and GitHub issue mentioned there for some workarounds and different reasons it can happen: Pulse report not going
Other than that, what’s needed to resolve issues like this one is details on your config /steps to reproduce. It realize steps to reproduce are particularly hard in a case like this — nonetheless it’s important.
I believe work is ongoing to add more debugging/logging info in this area, but it will take a while before there will be effects from that.