The Arlington T-stop escalator crisis

What the heck is wrong with the escalator at the Arlington T-stop? For the last couple of weeks it has been out of action most times I’ve been there. Heck, for the last few months it’s as if repair crews have been banging away at it every so often. So what’s the problem? Did somebody purchase a lemon escalator? Are the maintenance workers incompetent? Are the Arlington riders yobs who habitually damage the escalator?

WTFITFP?