Bitcoin gave up all its gains from weekend trading as analysts questioned whether the cryptocurrency is overheated.

Prices dropped as much as 8.2% during the European session, falling back to around $53,000. The world’s largest cryptocurrency has been on a tear this month, propelled by purchases from Tesla Inc. and institutional investors who say Bitcoin is an attractive alternative to gold and the dollar.

In February alone, Bitcoin is up more than 60%, prompting commentary that the run-up is excessive. The digital token hit a new all-time high on Sunday and came close to surpassing $59,000.

It’s widely believed that volatile weekend swings are driven by individuals trading the cryptocurrency at home. So it’s also possible that prices fell on Monday as institutional crypto traders, who follow normal business hours, responded to Elon Musk’s Saturday tweet that Bitcoin prices “seem high.”

“Mostly it is down to a massively long speculative market, combined with Elon Musk saying it looks a bit overdone,” said Jeffrey Halley, senior analyst at Oanda Corp.

Meanwhile, JPMorgan Chase & Co. strategists have warned about Bitcoin’s declining liquidity. Strategist Nikolaos Panigirtzoglou wrote in a note on Friday that liquidity for the digital coin was lower than that for the S&P 500 Index and gold, meaning “even small flows can have a large price impact,” he wrote.

“It should go without saying that new investors to Bitcoin should be prepared for major volatility and for prices to drop suddenly and as sharply as they have risen,” according to Neil Wilson, chief analyst at Markets.com.