I have “autoconnect” switched off and i manually connect and disconnect in meter selection screen by pushing plug-symbols. It does disconnect while speaking values etc.. Only times i had to really kill the app, is after updates, if i cant connect. Then (on my oneplus two) it is enough to swipe mooshi-app off from “multitasking” menu (not sure what to call it in english, but there is home, back and that multitask-button in android phones)
I somehow knew that i should be disconnecting from mooshimeter while logging, if i remember right, at some point every sample got written to memorycard when app was connected and only after disconnection was set intervals applied. Now user selected interval is used from the start, but now the problem seems to be that we all forget to disconnect and that, in my opinion, should happen automatically, not matter what we do..