Doepfer

I'm finding that many of my power cable headers are so loose that any 
movement of the cabinet can shake them partly out of the sockets and 
stop power to that module. I'm using a mixture of Doepfer, An.Sol., 
and home built, and the problem happens with all types - Sometimes 
even the weight of the ribbon cable is enough to pull the header 
sideways and loses a contact. This makes it problematical to take the 
modular on a gig.
Has anyone else had this trouble ?
If so, any cure ? - I'm thinking of Blu-Tack but is there a better 
solution out there ?
Richard