It doesn't happen super often, but lately I regularly have the problem that running a script with F5 (or also by clicking the corresponding button) doesn't work.
This time it happened that no statement was executed at all on the first try. On the second try, maybe 4 or 5 statements out of about 1200 were executed.
In the meantime, neither the start nor the end time is displayed when I press F5, which was still the case at the beginning. (I have activated the option "Show Script Start/End times").
"Interesting" is also the execution time of the last statement: 
