Recent latest update has bugs 503 error popup tried every known way.
I have the same issue, can we get this fixed urgently, all my sites are down.
I have again switched to aapanel 2 days no one give any response to this issue. 
I have never heard of it, looked it up, seems ok, I will build an alternate webserver and try it, I did purchase the add on, but if money is gone so be it. CP is troublesome lately, especially since the paid add on, takes lots of RAM, over uses it frequently.
Thanks for letting me know about it.