Detect stalled input diy emonpi

I have a rpi running emonpi (may2016 edition) its connected to an arduino running a 3phase version of the openenergymonitor firmware (based on what i found on the forum). The arduino is connected via softserial to the pi. Sometimes (not a fixed time sometimes 2 months or so) the feed stalls. (It gives the same numbers). Rebooting the pi (and not the arduino) fixes the problem.
Now i am detecting this problem with a script checking the current number with the previous ones (every 10 min on my other pi) and manually checking the feed if it happens more than one time in a row.

Is there any way i can check this on emonpi? Tried the standard script with nodered (with pushover) but it does not seem to work…