There was a cable at my work the kept falling or getting bad contact with a little touch, as I work With CAD it turns to be a pain! so I came with this quick fix to prevent it from falling. It's really dirt cheap as you will use just one thing.
So let's start!
Step 1: Materials
To do this you will need
1. The lose cable
2. Teflon Tape
Really dirt cheap as you see!
Step 2: Fixing
Warp some Teflon type around the cable plug, mine took about 10 turns, after that plug it again and see if it's fitting tight, if not try warping a bit more tape and test again until you got a tight fit.
Step 3: Done!
After a good fit, turn on you monitor to find out that it's not getting bad contacts anymore! if the issue continue even with a tight fit you might have blocked the contacts or your cable is broken inside and you will need to buy a new one :sad:
This can be used on a wide variety of lose connections around.