Wi-Fi not found even though it's available?

Have you relocated the unit or added any other nearby wireless or Bluetooth devices?

(could be interference).

Have new networks surfaced in your home/apartment (may be blocking your signal).

Have you changed anything or had any recent problems with your wireless router? Have you recently done an update or upgraded the OS?

Any recent physical damage (liquid or dropped)?

Any or all of those might be a reason for dropped wireless and I would check off those boxes before I jumped to hardware replacement.

If this answer is acceptable please remember to return and mark it.