Hi There, My laptop is an 16 inch model with i9 and I have this issue since the very first minute I bought the laptop....all big sur versions...11.1, 11.2, 11.3, 11.4, 11.5, 11.5.1.....unfortunately Is a shame that a 3k laptop has this problem and apple do not assume it...I already phone them 5 times....they say is a software problem and don't give a solution.. Regards,