Reading hundreds of posts on the same topic over the years, the consensus seems to be these mostly aren't real losses. The car calculates range based on measuring State-Of-Charge and translates this into miles of range left. When cars are routinely cycled as daily-drivers, range-used may only fluctuate 10 or 20% (ex you charge to 90% when you leave each morning and plug back in at night w/ 70% SOC. For some reason this causes the computer to slightly miscalculate the true battery's potential. Some have suggested that a couple deep discharges, followed by full charges will "rebalance" the pack. N=1 here, but when all was said and done (and balanced), my Model S 70D probably really only lost 4-5 miles of range, or <2%, over 3 years and 36,000 miles. This extremely low range loss over time & mileage is consistent with what many others have reported
Here's my 3yr/36,000 miles report:
3 Year/36,000 report, my experience w/ Tesla