Some major changes were made in the last patch on CN. There might be bugs when China is selected. Other servers will not experience issues. My apologies for the inconvenience.
Basic Attacks have a 10% chance to inflict Frail, reducing the target's ATK by 10% for 5s. Duration resets every time it is triggered. Attacking a Frail enemy has a 10% chance to restore 1 Signal Orb. 6s cooldown.