Ok my personal opinion but dealt with this problem twice now from others peoples ion i played with but your Board has gone basically...
This normally happens when playing with ions in wet weather...
They just stop firing for no reason, gas is there, all lubed up, new battery and registering trigger pulls but just not firing...
Send the board back and if its still under warranty they will send you a new one free... (however remeber to remove the banjos as the new board doesnt always come with them espically the bigger one that connects the reg to the board)
Just my thoughts
