MacBook Pro error -2003F in Recovery mode

You are barking up the wrong tree.

Because Mac applications are sandboxed, issues with Preview (including feeding Preview files that are wonky) should cause Preview to "Unexpectedly Quit" and not restart your entire system.

This does implicate overall system integrity.

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Now back to your original complaint and diagnosis.

Error code -2003 is NOT a System Error, whose value you looked up.

In Internet Recovery, these low negative thousands error messages indicate that your provided Wi-Fi Network is inadequate in some fashion, and cannot be used (for this purpose) in its current state. We have seen -1000 to -6000 reported, often with a letter appended.

Common problems include:

Hidden Network-name

required use of a proxy server to get Internet access

required use of a login page to get Internet access

Use of a login server or certificate to get Internet access

Use of PPPoE in the Mac to get Internet access (typically only applies to DSL)

Use of Fixed IP address rather than good old DHCP

Variance of the time by more than five minutes

Failure of Router to provide workable DNS server addresses, or providing 0.0.0.0 [may produce -2002f]

If you have an Ethernet port, you may in some cases be able to move your Mac close to the Router and connect to the Router using Ethernet.

The higher the number, the more obscure the problem.

If your battery was completely depleted, the Date&Time could have reverted to the default, which will not work. There is a terminal command to reset to current Internet Date&Time -- post back for assistance.

If your Mac starts up to error -1008F

If your Mac starts up to error -1008F - Apple Support

Safe Mode does a number of different things.

On older Intel Macs, hold shift at startup, but have your userid and password at the ready.

On newer Apple silicon Macs, shut down your Mac. Then as you start up again, hold the power key until the ’Startup Options’ screen appears.

A parade of unusual things happens.

• Your Mac loads just enough of the kernel to do a disk check. Then it proceeds to do a disk check. This can take an extra about five minutes.

• your userid and password are required, even if you normally auto-login. So have them handy.

• Your Mac adds ONLY a minimal set of Apple-Only extensions, Not including graphics acceleration extensions. Screen updates will therefore be wonky and slow, but it ultimately should be correct.

• Your Mac assumes defaults for as many settings as possible, including screen resolution. This is the key for re-setting the screen, but there is a little more to it: Resolution is likely to be temporarily lower and settings ordinary. Use this as a starting point to customize settings to your liking.

If you make NO changes, regular mode will just revert to what you had set before, so DO make changes!

Any changes you make in Safe Mode will "stick" in regular mode after you restart.

• after a Restart in normal mode, your Mac will take slightly longer to start up [once] because it rebuilds some system caches.

"Works in Safe mode, fails in regular mode" implies "It's something you added".

How to use Safe Mode on your Mac

Start up your Mac in safe mode - Apple Support

exactly how you invoke recovery changes where it loads from.

• Command-R: Start up from the built-in macOS Recovery System. Use this key combination to reinstall the latest macOS that was installed on your system, or to use the other apps in macOS Recovery.

• Option-Command-R: Start up from macOS Recovery over the internet. Use this key combination to reinstall macOS and upgrade to the latest version of macOS that’s compatible with your Mac.

• Option-Shift-Command-R: Start up from macOS Recovery over the internet. Use this key combination to reinstall the version of macOS that came with your Mac or the closest version that’s still available.

from:

Use macOS Recovery on an Intel-based Mac - Apple Support

restart into safe mode, which does a pass of disk repair before macOS loads.

Start up your Mac in safe mode - Apple Support

Consider downloading and running this little "discovery" utility, Etrecheck. It changes NOTHING. Etrecheck was developed by a senior contributor here, and uses mostly system calls and simple tests to collect often-needed information.

it contains little tests for speeds of devices, CPU utilization, memory usage, energy usage and a digest of recent problems, in one easy to use package. it does not even need to be Installed. Because less can be learned when your Mac is running great, best time to run is when your problems are actually occurring, if possible.

if you follow the directions faithfully, its report (pre-laundered of all personally-identifiable information) can be "Shared" to the System ClipBoard, then Pasted into an ‘Additional Text’ window in a reply on the forums.

Use Etrecheck Pro for free:

http://Etrecheck.com

The amount of data you get can be daunting. If you POST your report, some Readers here are willing to look over those reports, and can provide valuable insights.

Then start a reply on the forums, click the "Additional Text" Icon, and PASTE:

The most glaring problem is that your Boot drive is FULL.

Simply storing a few ifiles into at the cloud based storage will not help in the long run. You will need to obtain an external drive, and move some of your files onto it.

Best practice is to have at least 20 percent FREE drive space on the boot drive at all times.

You appear to have 29 G out of 500 GB FREE, or about 5.8 percent FREE.

Oh, and your battery needs to be replaced. Apple charges about US$250 for that service, and it includes a refurbished keyboard and comes with a 90 day warranty.

Your Mac can not operate without crashing until you increase the FREE space on your Boot drive to about 20 percent or greater.

Readers are happy to review your reports and make suggestions once you have completed that important task.

The forums are being wonky, so I can't see your old Etrecheck report.

But in general, those removed files need to remain until there has been a time machine backup to disk before their space can be freed.