Hey,
Sorry for the delayed reply.
Have you checked that the cluster is running as it ought? i.e write a key to a master, and see it replicated in the slaves?
You can also restart the Gateway, while keeping the Redis cluster running.
If all services are started together (Tyk and Redis cluster) the cluster can take longer than Tyk to go up. Meaning that gateway is looking for a service that doesn’t yet exist. Restarting the Tyk Gateway would mean they’re searching for something that exists and might work.