django-celery process goes to 100 % and tasks are not executed

django-celery process goes to 100 % and tasks are not executed

I am using last version of django-celery with RabbitMQ Worker on Ubuntu
12.04 Server. I start to have problem with celery tasks before a month ago
and I can not figure out what is the problem. I run celery into production
with supervisord, I dont know why but there is moments when some of the
process that run celery go to 100% usages of CPU and stay at that point
until I restart the celery an kill existing process. When this happen
worker does not get more tasks and they are not executed until I restart
the celery. Comman with which I run celery from supervisord is:
django-admin.py celeryd -v 2 -B -s celery -E -l INFO
Thank you for your help.