If a router's SSID shows up in your network list, then you are in it's range. A decent router (802.11ac or 802.11ax) should have a range of 820 feet, a little longer than the average length of a city block. A printer can show up in your list of available networks if it has “ad hoc" capabilities, meaning it can form a peer-to-peer network with other devices without a router or switch in between. If you are close to a router, then its SSID shouldn't keep appearing/disappearing from your network list. The tplink2020 SSID may come and go because of its distance.
BSODs are usually software-related. Try resetting your computer by going to Settings -> Update & Security -> Recovery. Under the Reset this PC, choose Get started. Follow the prompts. This will remove your apps and settings, but may prevent further crashes.
Try a full reboot of your device by holding down the power button, and then selecting ”Restart” from the pop-up menu. When it restarts, make sure that your Wi-Fi and/or cellular data are turned on. Try to access the files and videos from different browsers - Firefox, Edge, Chrome, etc. If these browsers don't work, try uninstalling and then reinstalling them.
Try checking the health of your battery with the AccuBattery app at https://play.google.com/store/apps/detai... See if there are any pending software updates for the tablet, as well. If AccuBattery reports that your battery is fine, and your software is up-to-date, then try changing your charging cable first, then the charging port.
While you are in Discord, try running the audio troubleshooter. Open a run box by holding down the Windows key and hitting R. Then, copy and paste the following into the box: %systemroot%\system32\msdt.exe -id AudioPlaybackDiagnostic Follow the prompts. Does it report any issues?
Google's Find My Device feature allows you to perform a factory reset on your phone from any device. Go to https://www.google.com/android/find and sign into your account. Choose your phone from the list and select Erase Device at the bottom of the webpage. Your phone should reset and you will be able to create your account again.
I would first try a hardware reset, and then contact Lenovo directly for further assistance. The hardware reset may delete some files in the Chromebook 's Downloads folder, however. To perform the reset, first place the touchscreen on the desired Chromebook. Then press and hold the Refresh button on the keyboard (it looks like a circular arrow.) Then tap the Power button. Release the Refresh button when the Chromebook starts up. If this doesn't work, then I would call Lenovo's tech support line at 1-855-253-6686, Option #1. It may be a proprietary configuration to exert control over how their products are used, like you said.
When replacing computer parts, it's best practice to select replacements that are identical to the original. Otherwise, you might get unexpected results. According to the documentation for the device, it comes with a 1.86GHz processor and 533MHz memory sticks. However, you replaced these with a 1.66 GHz processor and 800 MHz memory sticks. Try finding another T1350 processor (they've been discontinued by Intel, but may still be sold on Amazon or eBay), and 533MHz memory. This may make your device more stable.