force-reload markets when BadSymbol appears

closes #9463

freqtrade/exchange/exchange.py

@@ -486,11 +486,14 @@ class Exchange:
         except ccxt.BaseError:
             logger.exception('Unable to initialize markets.')
 
-    def reload_markets(self) -> None:
+    def reload_markets(self, force: bool = False) -> None:
         """Reload markets both sync and async if refresh interval has passed """
         # Check whether markets have to be reloaded
-        if (self._last_markets_refresh > 0) and (
-                self._last_markets_refresh + self.markets_refresh_interval > dt_ts()):
+        if (
+            not force
+            and self._last_markets_refresh > 0
+            and (self._last_markets_refresh + self.markets_refresh_interval > dt_ts())
+        ):
             return None
         logger.debug("Performing scheduled market reload..")
         try:
@@ -1547,6 +1550,12 @@ class Exchange:
             raise OperationalException(
                 f'Exchange {self._api.name} does not support fetching tickers in batch. '
                 f'Message: {e}') from e
+        except ccxt.BadSymbol as e:
+            logger.warning(f"Could not load tickers due to {e.__class__.__name__}. Message: {e} ."
+                           "Reloading markets.")
+            self.reload_markets(True)
+            # Re-raise exception to repeat the call.
+            raise TemporaryError from e
         except ccxt.DDoSProtection as e:
             raise DDosProtection(e) from e
         except (ccxt.NetworkError, ccxt.ExchangeError) as e: