Since updating to Cataline 10.15.4 my Mac shuts down and reboots about every hour.

Hello Sharon,

You can save us asking dozens of questions by submitting a report...

EtreCheck is a simple little app to display the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to help people help you with your Mac.

http://www.etresoft.com/etrecheck

Pastebin is a good place to paste the whole report...

https://pastebin.com/

Or use the paperclip at the bottom of a Reply to attach the full report here. :)

Workable but harder for me to work with...the Note tool on the bottom of this editor's toolbar, as shown in the image, to copy and paste the output from EtreCheck.

My Mac mini started acting up after the update.

My problem was solved after reinstalling the 10.15.4 update combo.

You can find it here: https://support.apple.com/kb/DL2037?locale=en_US