Monitor Flickering?

[s34n]

Hi there,

I have an MS9-29 monitor, i think its from an old sega rally machine, I have it connected to a DDR machine.... the input is 120V  but the monitor (if i remember correctly is 100v or 110v)...

anyway, it has been working fine for the last 2-3 months..... but now, if i leave the monitor switched on for 30mins+ it starts to flicker  (less frequent at first)... then after 30 more minutes, the flickering can be as much as once every 15seconds.

the flicker looks like a horizonal-ish line that makes the screen go black for literally a tenth of a second...

any suggestions of what it might be?


EDIT::: added video of problem

[s34n]

­