Old iPad stops working every day at 8 pm, what happened?

How to find it varies from system to system, but I wonder if screentime is turned on

Use Screen Time on your iPhone, iPad, or iPod touch - Apple Support

You know there is a setting on mine where it’s ‘share across devices’, so maybe it being on on one of your devices could mean it’s on on another one.

Old iPad models do not have any Screen Time features.

If your iPad is very old, like a 2011-2012, iPad 2, 3, 4 or iPad Mini 1st gen, it is very possible that many Internet based apps and many older versions of video streaming apps have stopped working and many more very old apps may have been made to stop working over a recent period of time.

When an app is purchased from any type of software app store, you do not pay to actually own the app ( the app developer is the one that actually owns all rights to their apps ) but you only pay for a license to just use the app for as long as a third party app developer decides to keep supporting and maintaining their apps.

Software companies go out of business and end support for their software all the time, for any myriad of reasons.

Also, third party app developers reserve the right to stop supporting their older software at any time,,for any reasons, also.

Very old apps, like many online Internet games, video streaming apps, the old iOS Mail app, that old Safari Web browser, old versions of banking apps, old versions of Google “cloud” Drive app ( offsite data storage servixe ), other types of Internet-based apps, may no longer operate.

If this iPad is very old, both Apple third party app developers have both removed and ended functionality of their very old apps from the iOS App Store from long ago.

Your “old” iPad may be, at least over 10 years and and maybe as old as 11-1/2 years old!

As such an iPad, it simply be far too old, unsupported and obsolete.

Sorry.

Consider that it is the Fall of 2022, now.

iPadOS 16.1 is here!

Your iPad will be, at the very least, possibly, 4 or more OS iterations behind, now.

You really need to seriously consider a purchase of a new iPad model OR a much, MUCH “newer” and less expensive, refurbished or used iPad models, from better known, trusted Apple product/device retailers/resellers, some locally or from online, on the Web/Internet, capable of running the latest iPadOS versions.

There are PLENTY of less expensive, newer, older iPad models that can run the latest, current versions of iPadOS.

If you need OR ONLY able to afford to purchase older, less expensive iPad models, look at older iPads from 2015 and later.

All of these older model iPads below, CAN, currently, run the latest releases of iPadOS 16.

2015-2017, 12.9 inch screen iPad Pro models. ( 1st gen Pencil support )

2016 9.7 inch screen iPad Pro models. ( 1st gen Pencil support )

2017,10.5 inch screen iPad iPad Pro models ( 1st gen Pencil support )

2017, 9.7 inch screen iPad 5th gen models ( NO Pencil support )

2018, 9.7 inch screen iPad 6th gen models ( 1st gen Pencil support )

2019, 10.2 inch screen iPad 7th gen models ( 1st gen Pencil support )

2020, 10.2 inch screen iPad 8th gen models. ( 1st gen Pencil support )

2019, 7.9 inch screen iPad Mini 5th gen models ( 1st gen Pencil support )

Get the largest internal data storage model you can afford as NO Apple iOS device has ANY expandable storage.

I am sorry that you had to learn all of this, but this does not change any of the facts regarding these very old iOS devices.

Sorry & Best of Luck to You!

Please define "stops working".

If you decide to go down the path of purchasing used, secondhand Apple devices, from individual Apple device sellers, here is how to avoid purchasing an Apple iOS/iPadOS device with user activation lock, in the future.

If you purchase any iPad, or any Apple iOS device, for that matter, used/second hand, online, or even in-person, make sure this iPad does NOT have user activation lock and has been properly reset for sale.

A properly reset for sale iPad should initially power up to an animated, multi-language “Welcome” screen.

DO NOT take the iPad seller's word that this iPad is user activation lock free!

We have seen plenty of used iOS device purchasers get scammed.

User Activation Lock can never be bypasss, circumvented or worked around IF there is no correct previous/original user information to be able to do so.

Apple doesn't get involved with ANY user activation locked, used/second-hand sold devices, either.

So, buyer beware!

If purchasing a used device in-person, power the iPad ON

If the iPad DOES NOT display the initial animated, multi-language “Welcome” screen, then pass on purchasing this iPad.

If the iPad powers up to any other screen, then forget purchasing this iPad.

You cannot trust that the seller actually has the correct needed info to properly reset the iPad back to factory settings right then and there before the actual purchase and exchange of money for the iPad, in question.

Pass on the device!

If you are purchasing this used iPad online ask the seller to provide multiple images, either online or be sent to you via email, showing this animated, multi-language “Welcome” screen of the interested in purchasing iPad model.

Even better, ask for a short video be sent to you showing this animated, multi-language “Welcome” screen, in action and in its entirety, posted to the online ad or emailed to you.

If the online iPad seller refuses any of these requests, pass on the iPad. DO NOT buy!

Good Luck to You!