I've had a Daikin minisplit unit in my room for a year or so, and it's been having constant issues keeping up any time it is actually warm outside. It's rated higher than the size of my room, and sometimes it keeps up just fine, but other times it will completely flop. Currently, it's in the 80s where I live, and with the unit turned to 68 degrees on max fan speed 24/7 it can't keep it down, with temps reaching 82 in the afternoons/evenings frequently and not coming back down into the mid/low 70s until well past midnight. The people who installed it have been out a half dozen times to try and repair it, have essentially replaced every part imaginable, and finally came to the conclusion that a cheap microwave was putting off RF interference and basically making it do random actions for no reason. I moved the microwave about 20 feet away, and for the first couple of days it was back to how it was when it was installed, keeping it at the set temperature easily and spending most of the time turned off or on very low fan speed. Recently, it's begun getting up to 82 again, regardless of the setting. The air blowing from the unit is barely cool to the touch no matter what it's set at. Does anyone know of any common issues I can troubleshoot without having to get the techs out to tell me there's nothing wrong with it again? The model number is FTX12AXVJU.