Firstly, great product, thanks.
Over the last couple of weeks, I’ve been getting an “Invalid TimeZone ID ” notification on my android phone. (Based on the debug info, it appears to be receiving a null value where it expects there to be a code representing the timezone.) I connect to a Synology DS215+ over https via a dyndns URL. Everything else seems to be working fine, but I have to swipe it away ever hour! I’ve checked that the timezone on the Synology is set correctly, and I’ve also looked through the WebDAV/CalDAV options on the Synology, to no avail.