Hello!
Just wanted to say that I’ve also been having the same issue, for a while now – I’d like to know if you have figured out what causes it or even better, how to fix it.
Also @gubros please let me know if you have figured out a solution.
Just FYI, I was running WC 5.1.0 and the plugin version was 5.0.0
I just updated to the latest versions, hoping that the issue will be resolved.