Apparently, someone does think there are problems in the business, or in the trading in the stock, that the company doesn't know about, or isn't telling you about...
I think it is the later... given I've been pointing out exactly what those problems ARE over the last few months ?
I'd still say the odds are that it is the insiders or their associates who are shorting the stock... knowing full well that they can cover the short with shares from conversions given the convertible notes being used for financing.