Closing Active Connections sooner for maintenance

I just ran some tests with Action on Service Down set to Reject. Reselect had no affect on my situation which I think is odd. My test includes me running a batch of roughly 1000 requests to the F5 for routing to my servers. I am using a test environnment that only has two servers in my pool. Sometimes my requests get stuck and spin. It's almost like F5 is caught in a loop trying to figure out which pool member to send the request to or it silently drops it. It doesn't happen every time but it happens often enough that it concerns me 1 out of five times.