None of what you posted works.
I started facing this same problem about two months ago.
(See page 1001 or near with my ID).
I've tried everything:
close and restart
uninstall and reinstall
uninstall, purge completely, download .deb installation file and install
clean cache
erase Wazapp account and register again -keeping pin number

And though I posted failure through different channels
(this site, Twitter, Wazapp page at facebook)
I haven't got any suggestion.
Have seen though it didn't only happen to me but you too.
And some other falks that posted issue at facebook.

Sorry I just update complaint but have no solution either.
If find something I will post it.
Tonight I was about to update to version 0.9.20-nightly 23.