diff --git a/app/src/main/java/com/eveningoutpost/dexdrip/Home.java b/app/src/main/java/com/eveningoutpost/dexdrip/Home.java
index 75ec69b26e..9c509efbf8 100644
--- a/app/src/main/java/com/eveningoutpost/dexdrip/Home.java
+++ b/app/src/main/java/com/eveningoutpost/dexdrip/Home.java
@@ -70,6 +70,7 @@
 import android.widget.TextView;
 import android.widget.Toast;
 
+import com.eveningoutpost.dexdrip.g5model.DexSyncKeeper;
 import com.eveningoutpost.dexdrip.g5model.DexTimeKeeper;
 import com.eveningoutpost.dexdrip.g5model.Ob1G5StateMachine;
 import com.eveningoutpost.dexdrip.g5model.SensorDays;
@@ -2630,11 +2631,11 @@ private void updateCurrentBgInfoCommon(DexCollectionType collector, TextView not
         }
 
         if (!isSensorActive) {
-            // Define a variable (notConnectedToG6Yet) that is only true if Native G6 is chosen, but, transmitter days is unknown.
-            boolean notConnectedToG6Yet = DexCollectionType.getDexCollectionType() == DexcomG5 && Pref.getBooleanDefaultFalse("ob1_g5_use_transmitter_alg") && Pref.getBooleanDefaultFalse("using_g6") && DexTimeKeeper.getTransmitterAgeInDays(getTransmitterID()) == -1;
-            if (notConnectedToG6Yet || shortTxId()) { // Only if G6 has been selected and transmitter days is unknown, or if G7 has been selected.
+            // Define a variable (notConnectedToG6Yet) that is only true if Native G6 is chosen, but, transmitter days is unknown or not synced yet.
+            boolean notConnectedToG6Yet = DexCollectionType.getDexCollectionType() == DexcomG5 && Pref.getBooleanDefaultFalse("ob1_g5_use_transmitter_alg") && Pref.getBooleanDefaultFalse("using_g6") && (DexTimeKeeper.getTransmitterAgeInDays(getTransmitterID()) == -1 || !DexSyncKeeper.isReady(getTransmitterID()));
+            if (notConnectedToG6Yet || shortTxId()) { // Only if G6 has been selected and transmitter is not synced yet, or if G7 has been selected.
                 notificationText.setText(R.string.wait_to_connect);
-            } else { // Only if G6 is not selected or G6 transmitter days is known.
+            } else { // Only if G6 is not selected or G6 transmitter is synced.
                 notificationText.setText(R.string.now_start_your_sensor);
             }
 
@@ -2653,7 +2654,7 @@ private void updateCurrentBgInfoCommon(DexCollectionType collector, TextView not
                     dialog.show();
                 } else {
                     if (!Experience.gotData() && !QuickSettingsDialogs.isDialogShowing() && !notConnectedToG6Yet && JoH.ratelimit("start-sensor_prompt", 20)) {
-                        // Show the dialog only if there is no data, and there is no dialog, and G6 is not selected or G6 is connected, and the rate limit is satisfied.
+                        // Show the start sensor prompt only if G6 is not selected or the G6 transmitter is synchronized.
                         final AlertDialog.Builder builder = new AlertDialog.Builder(this);
                         final Context context = this;
                         builder.setTitle(getString(R.string.start_sensor) + "?");
diff --git a/app/src/main/java/com/eveningoutpost/dexdrip/g5model/Ob1G5StateMachine.java b/app/src/main/java/com/eveningoutpost/dexdrip/g5model/Ob1G5StateMachine.java
index 1488d74b7c..5992a73a18 100644
--- a/app/src/main/java/com/eveningoutpost/dexdrip/g5model/Ob1G5StateMachine.java
+++ b/app/src/main/java/com/eveningoutpost/dexdrip/g5model/Ob1G5StateMachine.java
@@ -92,6 +92,7 @@
 import static com.eveningoutpost.dexdrip.utilitymodels.Constants.HOUR_IN_MS;
 import static com.eveningoutpost.dexdrip.utilitymodels.Constants.MINUTE_IN_MS;
 import static com.eveningoutpost.dexdrip.utilitymodels.Constants.SECOND_IN_MS;
+import static com.eveningoutpost.dexdrip.utils.DexCollectionType.getBestCollectorHardwareName;
 import static com.eveningoutpost.dexdrip.utils.bt.Helper.getStatusName;
 
 
@@ -133,6 +134,7 @@ public class Ob1G5StateMachine {
     private static volatile AuthRequestTxMessage lastAuthPacket;
     private static volatile boolean backup_loaded = false;
     private static final int OLDEST_RAW = 300 * 24 * 60 * 60; // 300 days
+    private static long relAutoSessionStartTime = HOUR_IN_MS * 3;
 
     public static long maxBackfillPeriod_MS = 0;
 
@@ -1550,14 +1552,19 @@ private static void processQueueCommand(Ob1G5CollectionService parent, RxBleConn
     }
 
     private static void checkAndActivateSensor() {
-        // automagically start an xDrip sensor session if  transmitter already has active sensor
+        // automagically start an xDrip sensor session if transmitter already has active sensor
         if (!Sensor.isActive() && Ob1G5CollectionService.isG5SensorStarted() && (!Sensor.stoppedRecently() || shortTxId())) {
             JoH.static_toast_long(xdrip.gs(R.string.auto_starting_sensor));
-            // TODO possibly here we want to look at last sensor stop time and not backtrack before that
-            Sensor.create(tsl() - HOUR_IN_MS * 3);
-            if (shortTxId()) { // If we are using G7
-                Sensor.create(tsl() - HOUR_IN_MS * 24);
+            if (shortTxId()) relAutoSessionStartTime = HOUR_IN_MS * 24; // If we are using a G7
+            final List<BgReading> last = BgReading.latest(1); // Last reading
+            if ((last != null) && (last.size() > 0)) { // Have we had a reading?
+                final long now = JoH.tsl();
+                final long since = now - last.get(0).timestamp; // Time since last reading
+                if (since < relAutoSessionStartTime) { // If the last reading was less than 3 hours ago, or if we are using G7 and the last reading was less than 24 hours ago
+                    relAutoSessionStartTime = since; // We will start the new session starting from the last reading.
+                }
             }
+            Sensor.create(tsl() - relAutoSessionStartTime);
         }
     }