diff --git a/src/BreCalClient/MainWindow.xaml.cs b/src/BreCalClient/MainWindow.xaml.cs
index e707445..40a85f3 100644
--- a/src/BreCalClient/MainWindow.xaml.cs
+++ b/src/BreCalClient/MainWindow.xaml.cs
@@ -505,6 +505,11 @@ namespace BreCalClient
                 try
                 {
                     double interval = (double) SHIPCALL_UPDATE_INTERVAL_SECONDS / PROGRESS_STEPS;
+
+                    if (Interlocked.CompareExchange(ref _uiUpdateRunning, 1, 0) == 1) // do not restart progress unless UI update has completed
+                        await Task.Delay(TimeSpan.FromSeconds(interval));
+
+                    System.Diagnostics.Trace.WriteLine("restarting refresh countdown");
                     for (int i = 0; i < PROGRESS_STEPS; i++)
                     {
                         await Task.Delay(TimeSpan.FromSeconds(interval), _tokenSource.Token);