Error causing MacBook Air to restart itself

Thanks; I at least have a "name" for the problem. I read the Apple article, and will follow through, though I’ve been trying to find what this Bridge OS 4.6 is , without success, so it can be removed. The only Bridge I know of is old Adobe Bridge that was part of a deleted Photoshop Elements pkg. When I search, including system files, all I find is some oddly named .sys file. I don’t mess with those!

I have tried logging in as my "fixit" user before closing, and though it requires that I log in each time —I don’t understand why I don’t stay logged in, as with my main user— I did not get the error code about having been restarted. Did this for about 2 weeks. I have not tried Safe Mode. As to the diagnostic steps Apple suggests since this is not an everyday occurrence, it’s hard to tell when things are "ok," and when it just hasn’t occurred "yet." It can be several days between episodes.

Do I run the Diagnostics while in Safe Mode, or in my troubled user mode?

My current Mojave (10.14.6 I think; I’m not currently at the Mac to look) was reinstalled by Apple when I took it in to them a few weeks ago. (Not a full wipe/reinstall.) It changed the problem, but didn’t fix it. Originally, the MacBook’s fan would be running, which is what would cause me to open it up, then I would only find a black screen, & I would have to shut down with the power button. Since the reinstall, it has been restarting itself, no black screen or overworking fan noise.

Thank you for pointing me to the article. Will be patiently working my way through.

John, Never used any security software other than Apple's own; I'm a diehard Mac user since 1993, so know they aren't needed.

I've been looking into migrating all my data to a new user, but it isn't as straightforward as migrating to a new mac, and it seems I might be migrating problems if I can't identify the problem beforehand.

This is the most recent report; hope someone understands, and can help me out (hopefully, without my having to touch Terminal).

Thank you for your response. I’m understanding more what this is, and the possibility of it not being easily, if ever, resolved. It does appear to be somehow user related on my Mac, but I’m afraid, after all I’ve read, that even with a new user account, if I move over all the apps, etc, the problem may follow.

I will go to my old 2011 MacBook to see which apps I haven’t used in years (since everything on the new 2019 Mac says they’ve been ‘modified’ in 2019) and delete those old applications. I’ll use included uninstallers where available, & just drag to trash for some. I have multiple backups, and have the Mojave installer in my Application folder. (Have not created the installer flashdrive startup disc, because Terminal scares me). During all this, which will take time, I’ll just log out of my main user account before closing the laptop. If you see any danger signs with this strategy, please tell me where to be cautious.

At this point I don’t see the advantage of updating to Catalina, since it appears to have the same issues, and it is guaranteed to make some of my apps useless. Thanks, again, for your information.