Small vertical lines

Hi I have a mag 256 running latest firmware my box is left on standby but every few days I get small vertical lines on the picture screen with a little fuller picture quality if I unplug the power lead and reboot the box this sorts it out for a few days or so has anyone come across this before or know what is causing it
 
Had a similar problem with magbox and by a process of elimination I found the lines disappeared by using an alternative hdmi connection to the tv. It cured the problem immediately was nothing to do with the magbox.
 
Hang on, in my instance it was a case of replugging the existing hdmi lead into an alternative hdmi inlet on the tv - not to replace the lead. I was told faulty hdmi connections is a common problem on Samsung & LG tv's.
 
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