implement the same fix for DMR and NXDN;

src/host/dmr/Slot.cpp

@@ -230,7 +230,9 @@ bool Slot::processFrame(uint8_t *data, uint32_t len)
     }
 
     if (m_rfState == RS_RF_AUDIO || m_rfState == RS_RF_DATA) {
-        if (m_rfLossWatchdog.isRunning()) {
+        // if RF TG hang is disabled, keep the loss watchdog alive from inbound
+        // RF frames so abrupt stream loss can still recover state.
+        if (m_rfTGHang.getTimeout() == 0U || m_rfLossWatchdog.isRunning()) {
             m_rfLossWatchdog.start();
         }
     }

src/host/nxdn/Control.cpp

@@ -403,7 +403,9 @@ bool Control::processFrame(uint8_t* data, uint32_t len)
     }
 
     if (m_rfState == RS_RF_AUDIO || m_rfState == RS_RF_DATA) {
-        if (m_rfLossWatchdog.isRunning()) {
+        // if RF TG hang is disabled, keep the loss watchdog alive from inbound
+        // RF frames so abrupt stream loss can still recover state.
+        if (m_rfTGHang.getTimeout() == 0U || m_rfLossWatchdog.isRunning()) {
             m_rfLossWatchdog.start();
         }
     }