Tombs concept problem

I don't like how 6 grps maps work, every time when 3 grps are standing nobody attacks so a lot of time is wasted.
Why nobody attacks? Cuz is too simple for the third grp to win easily...

My suggestions:

1)Put a timer and a score, at the end of the time grp with better score wins

2)Cancel 6grps arena and put 4grps or 8grps arena

*agree*

Once my group was beating another group and a third group came to their rescue because both groups were from the same region (Korea).