You may also want to call Costco tech support next time. https://www.costco.com/concierge.html You have a 90 day no questions asked return policy along with lifetime phone support. Depending on how you purchased the TV, you could have up to a 5 year warranty.
Sony is rolling out an update to Android 9, maybe your TV received that by means of OTA and it ended up to what you display.
Check the Sony support website to make sure your TV is on the ones to receive that update.