The robot vacuum cleaner pioneer iRobot is struggling with declining sales in the face of increasing competition. Last year, sales fell by around a quarter to $890.6 million, iRobot said after the US stock exchange closed on Monday. The US home market experienced a particularly strong 30% decline. All in all, iRobot closed the year with a loss of $304.7 million. The company was already in the red in 2022 by around $286 million. iRobot is also expecting a loss for the current year. IRobot wanted to be bought by Amazon in order to better compete against its rivals, some them cheaper. However, th…