Your filter may be blocked, which means air is not flowing through the system. Make sure coils are clean.The cause of the freezing may be that the air filter needs changing. Try changing the filter and running the unit at a higher temperature until the unit unfreezes.
Condensation is building up in the box of the air conditioner. It will need to be tipped back at an angle so the back of the air conditioner is an inch or so lower than the front to drain. If there is no drain hole, you can drill one.
May be your air conditioner filter is uncleaned, so clean that one.. its very important monthly activity for air conditioner.. its a main road to creating a sloshing sound. try it
There is refrigerant fluid inside the pipes that weave through the air-conditioner's innards. There may also be water trapped in trays because as the air cools it condenses out into a puddle.