No, that is normal. It is like that to save battery power.
Very relevant. It means there’s a problem with the software inside the emonPi. It sounds very like another post only yesterday or the day before.
Actually, this looks like a cross-posting: Emonhub process cannot open /var/log/emonhub/emonhub.log after update - #13 by OlavKristiansen
Also see Newly installed EmonPi shows all inputs as n/a - #2 by borpin