BKK to Hat Yai (HDY) and noticed service deterioration. Flight retimed one month in advance and cause me minor itinerary problem (despite their offer to change to earlier or later flight). Only one Bag drop counter for internet/ Kiosk check in opened. Their advertisement that internet check in is quicker and hassle - free is totally untrue. Once on board A320 aircraft is new and clean but seat pitch is a very tight. Aptitude of the crew does not seemed to be as good as their earlier year. My friend who sit upfront tried to purchase chicken rice and was told that only curry is available but I was told later that I can only get chicken rice because my curry is finished.