Some Chromebooks do not play well with certain wireless routers.
For example, the N22, C731, and 100e all use the same Intel Chipset. The 300e, 300e Gen 2, and the 100e Gen 2 all use the same wireless chipset (heck, the same motherboard).
First things first.. Check for updates for your home router. There may have been bug fixes that may have resolved these chipset conflicts.
Typical issue. Run electrical contact cleaner through the keys, or replace the keyboard.
The brass inserts that are embedded in the plastic pull out very easily. Buy extra top covers, and hinges. Typically one of the hinges breaks at the point where the bottom bolted support meets the LCD rail.
This one we've seen a lot of lately with student being at home. They have a strong connection with everything else in the home but not this machine. The solution is to clean the contacts of the WiFi Card, much like a Nintendo game cartridge. Use some isopropyl alcohol (70% is perfect) on it and re-seat back into the connector.
Digitizer on the touchscreen is failing. Replace the screen.
Major issue with the daughterboard where the pushbutton for the power button breaks off the board. Replace the daughterboard.