Aatrox Sated Devourer bug

Hi guys, I'm ProjectDestiny! I'm an Aatrox main. I like playing him in the jungle as he gets scary with Devourer, blah blah. One HUGE problem I have though. Aatrox's Blood Thirst/Blood Price passive (W) normally charges with 2 autos and procs on the 3rd, either healing him or dealing bonus physical damage at the cost of a little health. The attack speed from is really awesome on Aatrox, but there is a big, BIG problem. Aatrox's passive will either charge in 1 hit (the on-hit effect of charging his W is doubled) or it will NOT CHARGE AT ALL for upwards of 60 seconds sometimes. Smiting a minion or something seems to reset it to the proper procing, but this hurts, bad. When Aatrox doesn't have his W passive in fights, it can mean the difference between a quadra kill and getting melted. It's been bothering me a lot, luckily not enough to cost me many games yet, but it makes playing Aatrox in the jungle a huge gamble, because he is unable to guarantee burst/sustain once he has Sated Devourer.