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Are you using the original cmos battery that came with your 11th gen intel?
Maybe it’s not holding enough charge anymore & needs to be replaced.
Also, if you haven’t seen, the 11th gen has an issue where the cmos battery will run down if the laptop is left off a charger for long enough. Running li-ions down low enough degrades the battery so it can no longer hold as much charge. Framework will send you a replacement coin cell, regardless of the warranty period being over for the 11th gen.
Also see Rework Instructions for 11th Gen Mainboards to enable powering the RTC circuit from the main battery