I've got the latest beta version of the software and don't have any issues with the looper transport functions at all. However, the volume drop IS a large issue for me in regards to the looper.
I have had other buggy things going on with the transport functions but nothing with the looper. Did you get the latest firmware yet?
The only issues I've had with transport functions are when going from live mode to bank mode, the bank that is active (switch light is on) does not have the effects engaged. I have to switch to another bank, then back and activate the bank again.