Thank you for pointing out these problems. This was going to be a tight fit for my budget and the videos that you have posted so far tell me to wait for an upgraded version.
By default anything Wifi can upset 'Shortwave Radio Reception'. I have problems with my Tecsun pl-380 when I turn on my nearby laptop that's connected to a wall socket or if I turn on my local LED lamp, anyway (Congratulations on owning the LC90)
Gilles it is a smart Internet enabled radio. Turn off Wifi and Bluetooth off if you still have birdies on shortwave wait for a next firmware updates!!!
That is another thing noted, some of the indications are not always accurate. for example it told me I was on 10 meter band when tuned to 16 meters international broadcast band