Trigger random ability always try to use enemy position (or base position as fallback), and at 6.6 this can often lead to "cannot use ability" if you have loop ability (because often near no towers/miners). So in fact you waited 3-5 minutes for nothing, and need wait 3-5 minutes again.

I think in loop ability should use random tower and miner location instead of enemy. (Also reroll to other ability as fallback also will be good idea, like randomized deque list, if somehow it's failed again)