Flush all AWG channels at startup

pulse_lib/keysight/M3202A_uploader.py

@@ -43,10 +43,14 @@ class M3202A_Uploader:
         self.jobs = []
         self.acq_description = None
 
-        self.release_all_awg_memory()
-
+        self._init_awgs()
         self._config_marker_channels()
 
+    def _init_awgs(self):
+        self.release_all_awg_memory()
+        for awg in self.AWGs.values():
+            for ch in [1,2,3,4]:
+                awg.awg_flush(ch)
 
     def _config_marker_channels(self):
         for channel in self.marker_channels.values():