Apple’s stock is on a downward slide this year and investors are looking for signs of a turnaround during its upcoming July earnings call. Some market watchers have called out the company’s AI efforts as half-baked, and one research firm called for Tim Cook to step aside, despite a historically strong track record.

Analysts’ comments come as Apple names Sabih Khan to replace COO Jeff Williams, fueling debate over Tim Cook’s future at Apple

Two analysts are calling for the replacement of Apple CEO Tim Cook, who was hand-picked by Steve Jobs to succeed him in 2011. But Apple’s setbacks in AI have some questioning whether he’s still the right person for the job.