powermax error - Not starting due to too many communication errors.

Today I have started getting this error
Not starting due to too many communication errors.

From my powermax alarm system. Any ideas what it could be the only thing I have done different is swap out my rfxtrx433 for an E version

Cheers
Nath

Have you tried this:

Clear both variables (‘CommExceptions’ and ‘CommLastException’)

See also thread http://forum.micasaverde.com/index.php/topic,31613.msg243667.html