Meter is only about a year old, but haven't had any of those extra tokens so don't think it's applicable.
Either way the meter isn't rejecting... It's just hanging and then giving up but weirdly it IS getting to the meter else it wouldn't know the units... (search pan is successfully a few seconds after powering it back on... But just whenever I enter a token it sits there locked and frozen until it decides "no comms" then minute later back to normal).
Maybe it's soemthing to do with rain... As that hadn't stopped for the past 48 hours... 3 months... My memory is hazy with all this rain