Yes that has happened to me before. Some nintendo switches depending on when you bought it, are compatible with only 2.4ghz wifi or 5ghz wifi. And now some routers are all wifi6 thats supposed to be great new technology and all but sadly the nintendo sometimes doesnt find it. Try logging into your router with another device to view your wifi settings on your router. Then try to broadcast to a 2.4 ghz wifi signal. Or try 5ghz. Some routers are "automatic" and supposedly send either signal depending on device, but this doesnt always work that way. If last resort, try turning the nintendo off and back on and standing at different distances from your router. . Or not distances but just resetting the switch over and over til it connects. Also try restarting your router and turning the wifi off on all other devices in your home... if possible. This happened to my switch and sometimes it would connect, while not other times. For some reason it would help when it was far away on the dock in the livingroom tv which...

So the usb stick does not show up on another computer either? If thats the case, then there is definitely something wrong with it. If it's brand new, it could be that it sat in the heat for a really long time ? Maybe and it became damaged internally. Or dropped. If you shake it, is there any rattling parts inside? Or maybe try spraying the connectors with a contact cleaner spray, or compressed air (dusting spray) if anything maybe WD-40. If using wd40 shake the excess fluid out and dry with qtips. Or just clean with qtips. Is there anything stored inside it? Sometimes you may have encrypted the data inside the stick so that nobody can use it unless its plugged into the original device etc. Let us know Good luck

There is a guide on replacing the battery on this site and it also includes opening the tablet. See if it helps Good luck! XTouch CT-230141 Battery Replacement

There could be many issues, what have you checked? Is the laptop currently on? If currently on, try not to run the battery all the way down until you've found the problem. Some laptops have a battery diagnostic tool built in, try running that by searching for it in windows if u have, or apple. Battery may be bad. Battery also may have come disconnected or damaged. Check it visually underneath, check also if it is really hot. Try lowering the temperature by turning it off for a while, placing by a fan or A/C. Maybe even some ice under it inside a ziploc back and some paper towels. Check the charging port for cleanliness. Use qtips to clean and compressed air. Maybe a thin paintbrush or other... check the voltage coming out of the charger with a voltmeter if available. There could be many reasons, please post more info and answer some of my questions. Good luck!