Red wine sediment not settling in carboy

[Allan Gorin]

I have a carboy of red wine from pure grape juice where the sediment is not settling in the carboy. It was started in late September, after fermenting for 1-2 weeks, I racked adding oak chips and racking it again in January adding metabisulfite to it. I always sterilize all equipment each time it is racked. Any ideas as to what may be the problem or how I can remedy the situation?