iPhone X ear piece not working?

I purchased iPhone X around seven months ago and have experienced problem with ear piece for 2-3 times. Unless i restart the phone the ear piece wont start working. It is very infuriating because i never know whether it is the phone ear piece problem or network issue unless i switch to speaker mode. My guess is it has to do with recent ios update because i have not faced the issue in the first 4-5 months of the purchase. And may be it can be fixed with next ios update i guess if only Apple recognises this as a serious issue and not some random device situation.