Good Morning Steven, 

Thank you for contacting the U of M Extension Service. 

Please click on the following link from the U of M Extension Yard and Garden website: 

https://extension.umn.edu/fruit/growing-pears

If you scroll down, there are areas that expand on care and diseases. Review the information about fireblight. Are these the symptoms you are seeing? 

 The drought we've had the past few years has been very hard on trees. If the tree was not watered in the hot, dry summer, it could be showing the symptoms now. 

I would inspect the leaves and the trunk for signs of pests or disease. 

Good Luck!

Good Afternoon, 

I apologize. We are not familiar with all hybrids. 

Please click on the following link from the Missouri Botanical Garden: https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=253055&isprofile=1&basic=Pyrus%20calleryana

This information states: 

Problems

‘Bradford’ is particularly susceptible to limb breakage or splitting from strong winds, snow or ice. Although once exceedingly popular, it is now frequently not recommended by nurseries because of breakage potential. If used, it should be considered to be a short-lived tree that may need to be replaced in 15-20 years. It has respectable resistance to fireblight. Viable seed can be produced when Callery pear cultivars cross-pollinate. Please see above for more information on its invasive spread in Missouri and other states.

Also:

Bradford’ is a thornless ornamental pear that typically grows to 30-50’ tall with a pyramidal habit that becomes broader with age. ‘Bradford’ has been widely planted since the 1950s in residential and commercial areas in many parts of the U.S. Notwithstanding its beautiful form, over time it has become apparent that ‘Bradford’ has inherent and significant structural weaknesses.

Your tree is also known as the callery pear. In doing some futher internet research on the tree, I found the following article: 

https://www.bhg.com/gardening/trees-shrubs-vines/trees/bradford-pear-tree/

The above information I previously sent also applies to your tree, fireblight and drought. 

Based on the above research, your tree has out lived the anticipated life, and the limbs split and fall. 

Here is another link about preventing storm damage from trees: https://extension.umn.edu/planting-and-growing-guides/storm-damage-landscape-trees

Good Luck!