have you tried running a

clean-all

? i think what happens here is that if the zip file is corrupted or interrupted when we try to write it a previous time, then the zip library (and most compression utilities, for some reason) will try to open up the file and edit it instead of overwriting it. this may be better perf-wise? and this is also a wild guess regardless, but if it is correct then a

clean-all

(which should delete that file) should fix it