[ori_b]

There tends to be a tipping point when stock prices drop, from what I saw. But there are years of warning signs and slow decline before this happens. If you were watching RIM, for example, their trouble started when the first iphone came out, but it took years for it to reflect strongly in their stock prices. Nokia was in a similar state -- they had problems for years, but it was only recently that their stock dropped heavily. It was declining, but there were warning signs in the company long before.

However, it should be mentioned stock prices already go up and down like mad. Diversify, regardless of how solid a company is.