(Bloomberg) -- The last few times Nikolaos Panigirtzoglou witnessed such negative price action in Bitcoin, buyers returned in time to prevent deeper slumps. This time, the JPMorgan Chase & Co. strategist is worried. If the largest cryptocurrency isn’t able to break back above $60,000 soon, momentum signals will collapse, strategists led by Panigirtzoglou wrote in a note Tuesday. It’s likely traders including Commodity Trading Advisers (CTAs) and crypto funds were at least partly behind the buildup of long Bitcoin futures in recent weeks, as well as the unwind in past days, they said.