The Reliability History is showing improper shutdowns - lots of them.
Trusting that all those shutdowns are not due to some local power outage and the failure of the UPS to provide power until you can properly shutdown.
May simply be a bad connection inside your pc.
Check inside your build and ensure that all connections are fully and firmly in place. And that all cards, chips, RAM, jumpers are likewise fully and firmly in place.
If all is well and the shutdowns continue then the PSU is suspect. May be worthwhile to have it tested.
https://www.lifewire.com/how-to-manually-test-a-power-supply-with-a-multimeter-2626158
If you cannot do the testing yourself get a knowledgeable friend or family member to help test.
Which PSU company? Read a few product reviews and visit each company's website. Look for comments and reviews by verified purchasers as well.
Way too many discussions and arguments over the "best" PSU. Your choice should be made based on your requirements and budget.
And someone else following this thread may make a specific PSU recommendation. Fine with me.