GameStop, the biggest video game retailer in the United States, has announced its chief executive officer Michael K. Mauler has stepped down effective immediately for “personal reasons”.

Daniel A. DeMatteo has been appointed as the company’s interim CEO, and trading of GameStop shares have been halted temporarily on the stock market.

Speculation is rife as to why Mauler stepped down from his position, as he took over the company just a few months ago after his predecessor passed away.