BofA says the Nasdaq is flashing a bearish warning for tech stocks

Bloomberg/Getty ImagesTech stocks are driving the rally back from Friday's crash, but technicals signal trouble ahead.The Nasdaq 100 is flirting with a key level, flashing what BofA strategists say is a bearish signal.The strategists say longterm investors need to start hedging building risks in the market. The tech-heavy Nasdaq Composite is inching higher, chipping away at the losses incurred during Friday's plunge, but the index may not be in the clear.The Nasdaq 100 is flashing bearish signal