IWS 7.1 Viewer App stops randomly "Viewer module could not connect to Run-Time"

Hello,

I've got some trouble randomly on my IWS 7.1 App viewer. Something as :

"The Viewer module could not connect to the Run-Time. This could happen if the Run-Time has unexpectedly stopped due to lack of memory or some other internal problem."

After this error, I have to stop the runtime, the Studio if it is running, and start everything again.

It happens about many times a day.

You can see in the attachment a sample example of that, then it's not clear to help to find the cause of this error.

Any ideas on how to solve this ?

Regards