Hello,
I had it before with UCCX 7.0 and it was a BUG.
check these two bugs in 7.0
CSCtc32123
UCCX 7.x Select Resource Step reaches 1000 step max and fails
CSCsz93333
Modifying CSQ variable in the Select Resource Step after queuing a
call
Those two caused a group of agents to go to reserve state for like 60 agents causing the calls to DROP.
Before you open a TAC Case , i suggest you Apply UCCX 7.0(1)SR4 , if this is not fixed with the SR4 , i suggest you open a TAC so he can provide you with the ES02 since i am 99% sure that those two will fix your problem.
Please try the SR4 and let me know how it goes.
Hope it was helpful.
Amer