Not sure what MG you have but you mentioned MM, I am guessing an MM board. Did you check your clock source and disable switching over to local in the MG? Not really sure if it relates to E1s but these are the notes I made after having several issues with system switching to local clock. Something missing from the end is to disable switching.
MG-026-1(configure)# sh sync tim
SOURCE MM STATUS FAILURE
--------- ------------------- ----------------------- ---------------
Primary Not Configured
Secondary Not Configured
Local v0 Active None
Active Source: v0 Sync Source Switching: Enabled
MG-026-1(configure)# set sync inter primary v4
Warning: The media module in v4 is a DS1 media module, so <portids>
will be ignored.
MG-026-1(configure)# sh sync tim
SOURCE MM STATUS FAILURE
--------- ------------------- ----------------------- ---------------
Primary v4 Locked Out None
Secondary Not Configured
Local v0 Active None
Active Source: v0 Sync Source Switching: Enabled
MG-026-1(configure)# set sync source primary
MG-026-1(configure)# sh sync tim
SOURCE MM STATUS FAILURE
--------- ------------------- ----------------------- ---------------
Primary v4 Active None
Secondary Not Configured
Local v0 Standby None
Active Source: v4 Sync Source Switching: Enabled