I agree that it is temperamental - it keeps closing and I am constantly having to start from the beginning with logging in (no autofill available) and backing up manually. The sync takes a long time to get there before I have to start again next time as it has closed itself again.
The App on the PC and laptop is as unreliable - it keeps logging out and regularly tells me that I am not eligible for the service before righting itself some time later. The only solution I have found is patience!
