I als purchased my Whirlpool Cabrio washer and dryer from Lowe's a few years ago.(Whirlpool Cabrio Washer Model WTW7800XW2).
After a couple of years I also noticed the lid was starting to creak, however I didn't do anything about it until a year ago , doing research, noticed many complaints in same issue. The Cabrio lid is comprised of a heavy piece of glass inside a plastic frame allowing the top to be see through. The plastic frame is not durable enough to hold the heavy piece of glass.
Now both sides are cracked but the washer continued to operate okay.Seems to be a quality issue...not happy