I have a Marq 2 aviator and used to get at least 10 days battery life out of it. I haven’t changed any settings but only did a software update recently and now the battery goes from 100% to 0% over night. Interestingly, this only happens when connected to my iPhone (15 pro). When not connected to my phone then the battery drains 2% overnight. I have tried soft and hard re-set and removed the watch from Connect and disconnected from Bluetooth (incl ‘ forget device’)
Any ideas?