If its the end that plugs into the PC you can slightly pinch it and you'll feel its getting a much better/tighter connection
As for using other cables, I would just toss up a warning if your using a different cable for charging, data should be fine, but I've used many different cables for charging and some of them are no good
For example my friend has the new Samsung note Lte, thing is huge, looks like a mini tablet but the charge cable is as thin as string, I figured I could use it to charge my phone and almost started a fire, after almost 2 hours my battery only went up about 10 percent but the phone was to hott to touch I thought I broke it lol and the thin charge cable was so hot it felt like play-dough
So just watch it close when using a different cable for the first time