Haven’t found the source of the problem yet, but here are some observations:
1. if sequential mode is turned off, every time a station is turned off the controller will restart (yes, it’s a pretty serious bug)
2. the problem only happens when SD card is inserted. so I am pretty sure it has to do with the logging function.
3. the latest firmware 2.0.8 doesn’t have the issue.
So basically the issue (restart when a station is turned off) is reproducible by using firmware 2.0.7, with sequential mode turned off, and with sd card inserted. Very strange. I will have to dig a little further to see what’s going on.