My keychain keeps locking. I unlock it, and a few minutes later so app needs permission to use it again. I have the icon in the menu bar and see that the keychain is locked again. I've go keychain prefs checked for the keychain to remain unlocked.
I had rebooted, but I had not run first aid. I did that last night, it reported a couple of errors which were then repaired. So far I've not seen the unlock dialogue pop up since, so I'm hopeful that was the fix.