Getting no signal reports on the database

My TAPR 20M WWSPR transmitter putting out 1/10th Watt is no longer being heard by anyone. This seems to have happened only for the past day so not sure what is wrong. I use a 20M Magloop and it is returning an SWR of 1:1 so I'm inclined to think it is not the antenna but possibly only conditions in Western Australia.
Any ideas?
Thanks, Merv VK6BMT