Hi Simmy,
Thank you for those extra details and for taking the time to use a translator to share them.
Cannot interact with objects - The team are aware of this issue and are working to resolve it. In case you haven’t seen it I have a post on it that I updated today - [Known Issue][PS4/XB1] Loss of interactions
Continuous full inventory sound - I have submitted a report on this to the team and they are investigating the issue.
Disappearing items - You mentioned finding some after a few days. Do they reappear in the spot they have disappeared from or do you find them somewhere else on your island?
Crashes and Lag / FPS Drop - (I think this translation might not have gone through correctly - please let me know if I am wrong) If you are experiencing a lot of lag and crashes, especially around your fire where it is difficult to light, please try moving any objects if you can from around your fire. I know some players like to keep piles of sticks etc nearby but if you have a buildup in lag when it may contribute to the difficulty in lighting fires.
Strong sun - A few players have reported this and I have informed the team. Unfortunately there is no workaround but they are working on a fix for it.
I think that’s everything… If I missed or misunderstood anything, please let me know!