Jupyter stuck in run mode

I have a repeated and hard to reproduce problem with jupyter notebook: It is occasionally get stuck in run mode.

I use Enter+Shift to run cell. Than sometimes the notebook get stuck with [*] on it, it might happen in the most trivial cells such as cell with a=1

When I use the stop and start again the notebook execute the cell correctly only to get stuck again in the next cell.

I have seen the thread in :

https://github.com/jupyter/notebook/issues/714

But couldn't find any suggested solution.

This both with notebook and with lab


No source file or test is named. Start by reproducing the stuck [*] state with a trivial cell such as `a=1` in both Notebook and Lab, and compare with the referenced issue 714. Done means cells execute reliably without requiring stop and restart.

Written by the indexing model from the issue text.