Hello Rene, It won't be stuck in a loop.  Part of the balancing is keeping free space even between the members.  So when many pages are written on a specific member, the space balancer will create plans to move blocks to other members to free up space on that member.  It's an ongoing balancing act.  Additionally, during sustained periods of heavy I/O the Advanced Performance Load Balancer will swap pages to balance out latency between members.  Regards,  
We have a group with 4 members, total around 30TB of space. In the past we had lots of 500GB volumes for ESX, after installation of ESXi5.1 we are using larger volumes, around 1.5TB. So there was a lot of changes in the storage pool. We are seeing that EQ is load balancing the storage over the 4 members as expected. We thought it was finished couple of days agoo, but now it is balancing it again.. then for a couple of day's all the volumes are spread over 3 members, also as expected, but then it decides to storage load balance it again... and again..  Does it comes to an end sometimes? We have another group with also 4 members and also the same amount of space but there we are not using 1.5TB volumes yet.. there we dont see that EQ is continues storage load balancing the pool. Im not worried yet :), but everytime the volumes are redestributing over the members it does result on some reconnects for ESX as the part of a volume can and will reside on another member where on that moment esx doesnt have a connection to for that session at that moment. 
Storage Load Balancing process