This seems to happen every day from about 10am to 4pm GMT (i.e. UK time).  Then it seems to get faster again.  Been happening for about a week now.   Occasionally get a report that server is down, but then re-appears 10 to 20 seconds later.
            
                        
            
                                    
              
                Electron
                  4.2.10
                Windows
                  10
                                EasyEDA
                  6.4.16