All my Google Sheets appscript is giving problems on second run.

I am busy with a google sheet, so then i add a appscript in it, so I saved it and run it, then I change the script and now it hangs for ever to save it, or run forever when I run it. I must close the script and open it again to do one change and save it
It was thinking it may be the script problem, but now it is doing in all my google sheets with appscript in therm.

What can the problem be.