There is one way to do that - and it works.
There needs to be few ppl rushing the end.
Everytime we had 20+ (10+?dont know exact threshold) ppl doing last 20% of Traya, we had this nasty bug - which cost me at least 5 traya shards and several fullcrafts.
When EACG nerfed the rewards, there were less ppl wasting time in the P4 final rush - they just did not care. And voila - both raids where only like 5 ppl were in the rush were NOT affected by bug.
so 3+ raids where many ppl rushed - bug appeared.
2 raids where everything was slow and tidy - no bug.
