A quick hack until fixing the freezing properly

electrumx/server/session.py

@@ -567,9 +567,11 @@ class SessionManager(object):
             for hashX in set(hc).intersection(touched):
                 del hc[hashX]
 
-        async with TaskGroup() as group:
-            for session in self.sessions:
-                await group.spawn(session.notify(touched, height_changed))
+        # FIXME
+        async with ignore_after(15):
+            async with TaskGroup() as group:
+                for session in self.sessions:
+                    await group.spawn(session.notify(touched, height_changed))
 
     def add_session(self, session):
         self.sessions.add(session)