Jami android have to restart to reconnect network?

I use PC and mobile(android) to test jami. I found that I have to restart jami app in android to get reconnected to PC. when I sent a pic from pc to android , I would not to start automatically after jami-android restart. I have to resend file from PC , then android can get file quickly.
And setting to let android refresh(reconnected) when came from wakeup?

Maybe this is the issue?