fix(ui): reset stale per-connection state (radio-name label + DAX-TX stream) on reconnect

src/gui/MainWindow.cpp

@@ -1432,6 +1432,11 @@ MainWindow::MainWindow(QWidget* parent)
             m_radioInfoLabel->setText(m_radioModel.model());
         if (m_radioVersionLabel && !m_radioModel.version().isEmpty())
             m_radioVersionLabel->setText(m_radioModel.version());
+        // Also refresh the station/nickname label: the nickname can be corrected
+        // by the async "info" reply after connect, and this handler previously
+        // updated only model + version, leaving a stale station name on screen.
+        if (!m_radioModel.nickname().isEmpty())
+            setStatusBarStationText(m_stationLabel, m_radioModel.nickname());
     });
 
     // Propagate late-arriving SmartSDR+ subscription + dual-SCU diversity
@@ -5277,6 +5282,15 @@ void MainWindow::onConnectionStateChanged(bool connected)
 #endif
         audioStopRx();
         audioStopTx();
+        // Clear the cached DAX-TX stream id on connection loss. RadioModel already
+        // resets its own dax_tx state on disconnect, but AudioEngine::m_txStreamId
+        // was left holding the OLD id — so after a reconnect the AX.25 modem's
+        // "create the stream only if txStreamId()==0" guard saw a stale non-zero
+        // id, skipped ensureDaxTxStream(), and pumped modem audio to a dead stream
+        // (bare carrier, no modulation). Resetting it here makes the next transmit
+        // re-create the DAX-TX stream on the new connection.
+        if (m_audio)
+            m_audio->setTxStreamId(0);
 
         for (auto it = m_panFpsReconcileConnections.begin();
              it != m_panFpsReconcileConnections.end(); ++it) {

src/models/RadioModel.cpp

@@ -1767,6 +1767,14 @@ void RadioModel::connectToRadio(const RadioInfo& info)
     m_name    = info.name;
     m_model   = info.model;
     m_version = info.version;
+    // Seed nickname/callsign from the discovery packet so the status-bar station
+    // label is correct the instant onConnectionStateChanged(true) reads it. These
+    // were previously only set later from the async "info" reply, so on connect
+    // the label showed a STALE m_nickname — blank on the first connect, or the
+    // PREVIOUSLY connected radio's name (it is never cleared on disconnect). The
+    // async reply still refreshes them if they differ.
+    m_nickname = info.nickname;
+    m_callsign = info.callsign;
     m_declaredBands = parseDeclaredBands(info.bands);   // empty for real Flex
     m_maxSlices = maxSlicesForModel(m_model);
     if (reloadAntennaAliases())
@@ -3803,6 +3811,13 @@ void RadioModel::onDisconnected()
         m_staleSessionSerial = m_chassisSerial;
     m_chassisSerial.clear();
     m_callsign.clear();
+    // Clear the nickname here too, not just on the connectToRadio() seeding
+    // path: connectViaWan() takes no RadioInfo and the LAN auto-reconnect timer
+    // calls m_connection->connectToRadio(m_lastInfo) directly, both bypassing
+    // RadioModel::connectToRadio(). Clearing on the disconnect side closes all
+    // three paths at once, so a reconnect can never show the previous radio's
+    // station label while the async info reply is in flight. (#4260 review)
+    m_nickname.clear();
     m_region.clear();
     m_rxAudio = {};
     m_netCwStreamId = 0;