With these small connectors, the cable weight and stiffness tends to put a lot of stress on them. If not held at 90 degrees with some positive insertion force, movement and dragging sideways will loosen the mating surfaces, distort the connectors, or even dislodge the sockets from the circuit board.
The only way to ensure this is to double-tie the cables. That is:
a) One TIGHT tie a few cms from the connector so that it applies a slight positive pressure to the socket, to ensure the plug is always fully inserted.
b) A second tie a few cms further away to limit the bending going into the first tie, and so limiting the shear (sideways) force on the connectors.
Alternatively, using a single clamp that braces the cable along a few cms would do the same.
If you have your equipment loaded in a road case, you could use a back panel fitted with locking connectors of the IP67 type (weather-proof) because they typically include better strain relief. Even if you use standard feed-through connectors on the panel, at least if any damage occurs, it will not be to expensive equipment! Internally, you can set the cables to minimise problems, but even if loose, you know that they will never be placed under stress.
I bought XLR backplates (like 1U 12 x XLR Socket Rack Panel), fitted with 1394a (like Switchcraft EHFW2BX Straight Wired Firewire 6-Pin Feedthru Jack - Black) and optical (like Switchcraft EHTL2 Toslink Feed-Thru Connector For Panel Mounting) feed-through connectors. I also fitted feed-through connectors for 1394b, RJ45, BNC, USB2 and HDMI, so you can really go to town. I use the same panels and connectors to connect between the inside and outside of the studio.
I consider the miniDisplayPort (mDP) one of the worst in this regard. Not only has the locking mechanism of DisplayPort been abandoned, but the cables, especially the 10GHz ones, just seem far too large and stiff. To me, mDP is under-engineered.