I don't have an -1V, but I used to have the predecessor, the -1N and a -3.
They had a very hair trigger, quite a light touch that might be causing problems if you have a heavy touch.
Considering that the -1V has improved weather seals around the shutter button, blowing air there shouldn't make any difference.
It isn't like the old mechanical shutter buttons.
I suspect it is a problem with the electronic board underneath the shutter button.
I have seen that sort of problems with push buttons in many electronic cameras, but not on Canon.
My experience is with Minoltas.
And it is the opposite: buttons needing extra pressure to activate functions.