iWatch constantly disconnects/locks after current software update

Hello KeithStuart,

Thanks for asking the Apple Support Communities for help with your Apple Watch disconnecting often. Thanks for also letting us know you are currently operating iOS 13.1.3.

1. Please update to iOS 13.2. There are bug fixes and improvements which may help with the iPhone: Update your iPhone, iPad, or iPod touch - Apple Support

2. Also update to watchOS 6.1, which includes improvements also. Update your Apple Watch - Apple Support

3. If the issues remain, please ensure you are wearing the watch correctly as per this help article: Wearing your Apple Watch - Apple Support

4. Next, ensure nothing is blocking the sensors and other guidance in here. The same things that affect the heart rate, affect wrist detection: Your heart rate. What it means, and where on Apple Watch you’ll find it. - Apple Support

• For best results, the back of Apple Watch needs skin contact for features like Wrist Detect, the Taptic Engine, and the heart rate sensor.

• The sensors will work only if you wear Apple Watch on the top of your wrist.

• Your Apple Watch should be snug but comfortable.

Thanks and have a wonderful day.

Not sure if this helps. But I have also been having the same issue since the update. Today I realized it is probably due to weather change -- I started to wear long sleeves. I was able to reproduce the problem by simple move the watch over my sleeve, it immediately got locked :)