We seem to still be stuck in the "buy on speculation, sell on news" merry-go-round!
For me, I'd say "sell and and never look back". Lately I sold all PTK shares I held in TFSA, reducing my PTK holdings by 30%. There are way better places to make money in TFSA these days, and this is what I am doing, and so far, successfully. Life is short, and I don't want to grow old before my PTK investment is realized. And this is, unfortunately, the trend I start seeing with this investment.