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My Emonglcd regularly locked up every week. 

I made some debugging and I found that the code always halted on one of these two instructions:
rf12_sendStart(0, &emonglcd, sizeof emonglcd);
rf12_sendWait(0);

Did not investigate deeper into the sommunication library, but I found that the watchdog code being used on EmonTX is valid also for Emonglcd

Here are the lines I added to the code. With these modifications I had 2 months of operation without problems

#include <avr/wdt.h>
...
#include "EmonLib.h"
ISR(WDT_vect) { Sleepy::watchdogEvent(); }ISR(WDT_vect) { Sleepy::watchdogEvent(); }
... ...

wdt_enable(WDTO_8S); //before start of main loop: enable a 8s based watchdog
...
wdt_reset(); //on end of main loop

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Hope this could help others in my same situation.

Best regards