Hello mpan,
If this is a situation that happens more or less frequently, and, as you said, it should not depend on your internet provider, there may be something that needs investigation in the processes of the Shake itself.
To help with this, when you have the chance, can you download and post the logs from your Shake here so that I can take a look? If needed, instructions on how to do so can be found on this page: Please read before posting!
Thank you!