In the 2019.16.x updates, certain 85 packs had the upper cell voltage capped to 4.07V compared to the original 4.2V. If you are affected, you will see around a 25 mile (or 10-12%) drop in range. 100% range before the update was typically 256 miles, and 233 after the update.
In addition many 85 owners are complaining about much slower Supercharger speeds. Charges typically require up to 50% more time to achieve the same charge as before. It is also difficult to charge beyond 90% on the Superchargers because of the extra time required. Some owners have also reported that it is impossible to charge above (the new reduced) 98% SOC.
There is lots of speculation about what is going on, why Tesla introduced the software cap, and whether such a cap is in breach of consumer rights. Tesla are saying very little unfortunately. No one is clear if the changes are in response to safety or fire risk, and whether the software cap even improves safety.
Affected owners are awaiting more information which should be forthcoming from the class action against Tesla.
If you have a spare couple of hours, the 5000+ post thread has nuggets of information.