Sagemaker Canvas keeps restarting during analysis

Using Sagemaker Canvas I often get the message: An unexpected error has occurred whilst completing an action in data wrangler Try again. If the problem persists, contact AWS support. This happens whilst I was using data wrangler. I would complete a step and often get this message. I noticed that that Sagemaker canvas will automatically restart. When it restarts I have all the steps in my data flow and not data is lost. This has happened half a dozen times, so far and happens when I use different browsers Why is this happening. This does not look like a stable application