Addons suddenly stop working

Hi guys !

I'll make it simple :

Some of my addons, namely MSCT and RECOUNT just stop working after a period of time. Everything is fine for many hours and then nothing... the text doesnt appear anymore and my recount box stays empty. When this occures, other addons like OMEN work perfectly..

Any clue of what would cause this and how to repair it ?

more information :
- I have the problem with all my char
- my addons memory = 45Mb
- /reload is useless
- everything is back to normal when I relog.


Thanks :)