Reconnect substrate on error

src/chain_data.py

@@ -174,6 +174,7 @@ last_commitment_sync: datetime = datetime.fromtimestamp(0, TIMEZONE)
 
 
 def sync_metagraph(timeout: int = 10):
+    global substrate
     global last_sync
     now = datetime.now(TIMEZONE)
     if now - last_sync < timedelta(minutes=5):
@@ -212,3 +213,4 @@ def sync_metagraph(timeout: int = 10):
             print("Timed out while syncing metagraph")
         except Exception as e:
             print(f"Error occurred while syncing metagraph: {e}")
+            substrate = get_substrate()