Q: Sound problem on iPhone 6s plus

Few days ago I had an issue with my iPhone 6s plus. I lost the sound and the phone was indicating that headphones are connected. They weren't. Tried to restart the phone, reseted it but no luck. It just went away 2 hours later.
Today I had the same issue but without the headphone indication. Did anyone else have the same problem and if so, how to fix it. Cheers for the help peeps!!!