retry on reverify existing backlinks

i had a load of links removed after reverifying & when i checked the urls the links were still there, is it possible to have gsa ser retry to verify a few times because the urls were probably just having hosting issies or whatever, i have looked under
project>options at the top & cant see anything.
the tick box “remove after 1st verification try” is greyed out & cant be ticked (not what i wanted but cant be ticked anyway)
theres an option “dont remove urls” which can be ticked, but i want it to recheck the urls, & then remove the links if the link is definitely not there,